"one occurrence each. A Friday the 13th occurs during any month that begins on a Sunday. The fear of the number 13 has been given a scientific name: ""triskaidekaphobia""; and on analogy to this the fear of Friday the 13th is called ""paraskevidekatriaphobia"", from the Greek words ""Paraskeví"" (Παρασκευή, meaning ""Friday""), and ""dekatreís"" (δεκατρείς, meaning ""thirteen""). The superstition surrounding this day may have arisen in the Middle Ages, ""originating from the story of Jesus' last supper and crucifixion"" in which there were 13 individuals present in the Upper Room on the 13th of Nisan Maundy Thursday, the night before his"
"Tetraphobia Tetraphobia (from Greek τετράς—""tetras"", ""four"" and φόβος—""phobos"", ""fear"") is the practice of avoiding instances of the number . It is a superstition most common in East Asian nations. The Chinese word for ""four"" (, pinyin: sì, jyutping: sei), sounds quite similar to the word for ""death"" (, pinyin: sǐ, jyutping: sei), in many varieties of Chinese. Similarly, the Sino-Japanese, Sino-Korean, and Sino-Vietnamese words for ""four"", shi (し, Japanese), and sa (사, Korean), sound similar or identical to ""death"" in each language (see Korean numerals, Japanese numerals, Vietnamese numerals). Tetraphobia is known to occur in Korea and Japan since the"
"are considered severe as they are personally attached to the person. Tetraphobia far surpasses triskaidekaphobia (Western superstitions around the number 13). It even permeates the business world in these regions of Asia. Chinese is a tonal language with a comparatively small inventory of permitted syllables, resulting in an exceptionally large number of homophone words. Many of the numbers are homophones or near-homophones of other words and have therefore acquired superstitious meanings. The Chinese avoid phone numbers and addresses with fours, especially when they are combined with another number that changes the meaning. Example: “94” could be interpreted as being dead"
"a lucky number in Chinese culture. In Hong Kong, some apartments such as Vista Paradiso and The Arch skip all the floors from 40 to 49, which is the entire 40s. Immediately above the 39th floor is the 50th floor, leading many who are not aware of tetraphobia to believe that some floors are missing. Tetraphobia is not the main reason, but rather as an excuse to have apartments with 'higher' floors, thus increasing the price, because higher floors in Hong Kong apartments are usually more expensive (see 39 Conduit Road). For Cantonese speakers, 14 and 24 are considered more"
"the fourth day of the month, Asian people were thirteen percent more likely to die of heart failure. In California, Asians were twenty-seven percent more likely to die of a heart attack on that day. The purpose of the study was to see if psychological stress caused by belief in this superstition could indeed trigger deadly heart attacks and other fatal incidents. Tetraphobia Tetraphobia (from Greek τετράς—""tetras"", ""four"" and φόβος—""phobos"", ""fear"") is the practice of avoiding instances of the number . It is a superstition most common in East Asian nations. The Chinese word for ""four"" (, pinyin: sì, jyutping:"
"Western art or literature are, more likely than not, intentional references to ""the Beast"" symbolism. Such popular references are therefore too numerous to list. It is common to see the symbolic role of the ""integer"" 666 transferred to the ""digit sequence"" 6-6-6. Some people take the Satanic associations of 666 so seriously that they actively avoid things related to 666 or the digits 6-6-6. This is known as hexakosioihexekontahexaphobia. The number is cited as 616 in some early biblical manuscripts, the earliest known instance being in Papyrus 115. 666 (number) 666 (six hundred [and] sixty-six) is the natural number following"
"is widely associated as being the Number of the Beast, used in symbolism to represent one of the creatures in the Apocalypse or, more commonly, the Devil. This number is surrounded on either side by thirteen zeroes and is 31 digits in length (thirteen reversed), with thirteen itself long regarded superstitiously as an unlucky number. In the short scale, this number would be named ""One nonillion, sixty-six quadrillion, six hundred trillion and one"". In the long scale, this number's name would be ""One quintillion, sixty-six billiard, six hundred billion and one"". Belphegor's prime Belphegor's prime is the palindromic prime number"
"Telephone phobia Telephone phobia (telephonophobia, telephobia, phone phobia) is reluctance or fear of making or taking phone calls, literally, ""fear of telephones"". It is considered to be a type of social phobia or social anxiety. It may be compared to glossophobia, in that both arise from having to engage with an audience, and the associated fear of being criticized, judged or made a fool of. As is common with other fears and phobias, there is a wide spectrum of severity of the fear of phone conversations and corresponding difficulties. In 1993 it was reported that about 2.5 million people in"
"etc. are also often left out in wedding dinners or other social gatherings in these countries. In many residential complexes, building block 4, 14, 24 etc. are either omitted or replaced with block 3A, 13A, and 23A. Hospitals are of grave concern and the number 4 is regularly avoided altogether. Tetraphobia can dictate property prices. Neighborhoods have removed four from their street names and become more profitable as a result. In the same way, buildings with multiple fours can suffer price cuts. Four is also avoided in phone numbers, security numbers, business cards, addresses, ID numbers, and other numbers and"
"used, therefore the number 4 is rarely avoided. Even so, in the past Vietnamese people often named their children ""tư"" or ""tứ"", which means ""the fourth child born in family"". In South Korea, tetraphobia is less extreme, the number 4 sounds like ""decease"" and ""died"" (사), but the floor number 4 or room number 4 is almost always skipped in hospitals, funeral halls, and similar public buildings. In other buildings, the fourth floor is sometimes labelled ""F"" (Four) instead of ""4"" in elevators. Apartment numbers containing multiple occurrences of the number 4 (such as 404) are likely to be avoided"
"Interesting number paradox The interesting number paradox is a semi-humorous paradox which arises from the attempt to classify natural numbers as ""interesting"" or ""dull"". The paradox states that all natural numbers are interesting. The ""proof"" is by contradiction: if there exists a non-empty set of uninteresting natural numbers, there would be a smallest uninteresting number – but the smallest uninteresting number is itself interesting because it is the smallest uninteresting number, thus producing a contradiction. The number 1729 has been called a taxicab number, because in a discussion between the mathematicians G. H. Hardy and Srinivasa Ramanujan about interesting and"
"Thirteenth floor The thirteenth floor is a designation of a level of a multi-level building that is often omitted in countries where the number is considered unlucky. Omitting the 13th floor may take a variety of forms; the most common include denoting what would otherwise be considered the thirteenth floor as level 14, giving the thirteenth floor an alternate designation such as ""12A"" or ""M"" (the thirteenth letter of the Latin alphabet), or closing the 13th floor to public occupancy or access (e.g., by designating it as a mechanical floor). Reasons for omitting a thirteenth floor include triskaidekaphobia on the"
"to an extent that the value of the property is adversely affected. The national railroad, Korail, left out the locomotive number 4444 when numbering a locomotive class from 4401 upwards. Some of these combinations were considered more unlucky than the individual 4, 14 sounds like ""Time to be deceased"" (사망 할 시간), 44 sounds like ""Died and Deceased"" (사망 및 사망자). Efforts to accommodate tetraphobia-related sensitivities have been seen in Canada which has a significant population of Chinese descent. Richmond Hill, Ontario, banned the number four on new houses in June 2013. Property developers in Vancouver omitted the number from"
"his book ""Wonders of Numbers"" he has so described the history of schizophrenic numbers: Schizophrenic number A schizophrenic number (also known as mock rational number) is an irrational number that displays certain characteristics of rational numbers. ""The Universal Book of Mathematics"" defines ""schizophrenic number"" as: The sequence of numbers generated by the recurrence relation f(n) = 10 f(n − 1) + n described above is: The integer parts of their square roots, alternate between numbers with irregular digits and numbers with repeating digits, in a similar way to the alternations appearing within the fractional part of each square root. Clifford"
"69 (number) 69 (sixty-nine) is a number following 68 and preceding 70. 69 is: Because 69 has an odd number of 1s in its binary representation, it is sometimes called an ""odious number."" Of note is that 69 () and 69 () together use every decimal digit from 0-9. 69 is equal to 105 octal, while 105 is equal to 69 hexadecimal. This same property can be applied to all numbers from 64 to 69. On many handheld scientific and graphing calculators, the highest factorial that can be calculated, due to memory limitations, is 69! or about 1.711224524. Sixty-nine may"
"Trypophobia Trypophobia is an aversion to the sight of irregular patterns or clusters of small holes, or bumps. It is not officially recognized as a mental disorder, but may fall under the broad category of specific phobia if fear is involved and the fear is excessive and distressing. People may express only disgust or both fear and disgust to trypophobic imagery. The understanding of trypophobia is limited. Although few studies have been done on trypophobia, researchers hypothesize that it is the result of a biological revulsion that associates trypophobic shapes with danger or disease, and may therefore have an evolutionary"
"3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 156, 173, 208, 248, 285, 4A5, 5B0, 5B1, 60B, 64B, ... The sequence of base 3 narcissistic numbers starts: 0, 1, 2, 12, 22, 122 The sequence of base 4 narcissistic numbers starts: 0, 1, 2, 3, 130, 131, 203, 223, 313, 332, 1103, 3303 (sequence and in OEIS) In base 2, the only narcissistic numbers are 0 and 1. The number of narcissistic numbers in a given base is finite, since the maximum possible sum of the ""k""th powers of a ""k"" digit number in base"
"666 (number) 666 (six hundred [and] sixty-six) is the natural number following 665 and preceding 667. Six hundred and sixty-six is called the ""number of the Beast"" in (most manuscripts of) chapter of the Book of Revelation, of the New Testament, and also in popular culture. 666 is the sum of the first 36 natural numbers (formula_1, i.e. ), and thus it is a triangular number. Notice that ; 15 and 21 are also triangular numbers; and . In base 10, 666 is a repdigit (and therefore a palindromic number) and a Smith number. A prime reciprocal magic square based"
"digits ""d"" satisfying 0 ≤ ""d"" ≤ 9. Such a number ""n"" is called narcissistic if it satisfies the condition For example, the 3-digit decimal number 153 is a narcissistic number because 153 = 1 + 5 + 3. Narcissistic numbers can also be defined with respect to numeral systems with a base ""b"" other than ""b"" = 10. The base-""b"" representation of a natural number ""n"" is defined by where the base-""b"" digits ""d"" satisfy the condition 0 ≤ ""d"" ≤ ""b""-1. For example, the (decimal) number 17 is a narcissistic number with respect to the numeral system with"
"Polydivisible numbers represent a generalization of the following well-known problem in recreational mathematics : The solution to the problem is a nine-digit polydivisible number with the additional condition that it contains the digits 1 to 9 exactly once each. There are 2,492 nine-digit polydivisible numbers, but the only one that satisfies the additional condition is Other problems involving polydivisible numbers include: Polydivisible number In mathematics a polydivisible number (or magic number) is a number with digits ""abcde..."" that has the following properties : For example, 345654 is a six-digit polydivisible number, but 123456 is not, because 1234 is not a"
"Narcissistic number In recreational number theory, a narcissistic number (also known as a pluperfect digital invariant (PPDI), an Armstrong number (after Michael F. Armstrong) or a plus perfect number) is a number that is the sum of its own digits each raised to the power of the number of digits. This definition depends on the base ""b"" of the number system used, e.g., ""b"" = 10 for the decimal system or ""b"" = 2 for the binary system. The definition of a narcissistic number relies on the decimal representation ""n"" = ""d""""d""...""d"" of a natural number ""n"", i.e., with ""k"""
"Square root of 3 The square root of 3 is the positive real number that, when multiplied by itself, gives the number 3. It is more precisely called the principal square root of 3, to distinguish it from the negative number with the same property. It is denoted by . The square root of 3 is an irrational number. It is also known as Theodorus' constant, named after Theodorus of Cyrene, who proved its irrationality. The first sixty digits of its decimal expansion are: As of December 2013, its numerical value in decimal has been computed to at least ten"
"the Number Devil before learning of his actual name, Teplotaxl, later in the story. Over the course of twelve dreams, the Number Devil teaches Robert mathematical principles. On the first night, the Number Devil appears to Robert in an oversized world and introduces the number one. The next night, the Number Devil emerges in a forest of trees shaped like ""ones"" and explains the necessity of the number zero, negative numbers, and introduces ""hopping"", a fictional term to describe exponentiation. On the third night, the Number Devil brings Robert to a cave and reveals how ""prima-donna"" numbers (prime numbers) can"
"Kilimanjaro"", issues 563-633, main villain: Tac-Tac 24. ""The Triangle of Death"", issues 622-698, main villain: Black Spider 25. ""Eye of Satan"", issues 685-752, main villain: Kardo 26. ""The Revenge of Karma"", issues 742-817, main villain: Karma 27. ""The Shadow of Terror"", issues 806-887, main villain: Count Bartok 28. ""The Seventh Death"", issues 880-944, main villain: Namilak 29. ""Black Magic"", issues 935-989, main villain: Black Spider 30. ""Panthers of Istanbul"", issues 978-1018, main villain: Prince Sakiri 31. ""Black Buddha"", issues 1009–1070, main villain: Ramar 32. ""Masks of Death"", issues 1061–1101, main villain: Lukas Hunt 33. ""The Chinese Terror"", issues 1092–1153, main"
"""b"" is and if ""k"" is large enough then Every base ""b"" ≥ 3 that is not a multiple of nine has at least one three-digit narcissistic number. The bases that do not are Unlike narcissistic numbers, no upper bound can be determined for the size of PDIs in a given base, and it is not currently known whether or not the number of PDIs for an arbitrary base is finite or infinite. The term ""narcissistic number"" is sometimes used in a wider sense to mean a number that is equal to any mathematical manipulation of its own digits. With"
"Polydivisible number In mathematics a polydivisible number (or magic number) is a number with digits ""abcde..."" that has the following properties : For example, 345654 is a six-digit polydivisible number, but 123456 is not, because 1234 is not a multiple of 4. Polydivisible numbers can be defined in any base - however, the numbers in this article are all in base 10, so permitted digits are 0 to 9. The polydivisible numbers are The smallest base 10 polydivisible numbers with ""n"" digits are The largest base 10 polydivisible numbers with ""n"" digits are The number ""F""(""n"") of polydivisible numbers of"
"issues 231-259, main villain: The Octopus 14. ""Puppets of Hell"", issues 256-287, main villain: Bengala 15. ""Return of the Black Spider"", issues 280-315, main villain: Black Spider 16. ""The Fantastic Journey"", issues 310-351, main villain: Poseidon 17. ""Brains of Hell"", issues 344-387, main villain: Humanon 18. ""Horsemen of Terror"", issues 378-416, main villain: Zulma 19. ""Mysteries of the Chinese Wall"", issues 411-452, main villain: The Black Knight 20. ""The Invisible Assassin"", issues 447-485, main villain: Baron Kruger 21. ""The Sacred Pharaoh"", issues 478-522, main villain: Nefris 22. ""The Red Dragon"", issues 513-572, main villain: Karma 23. ""The White Witch of"
"numbers (possibly including = 0), writing in his diary his famous words, ""ΕΥΡΗΚΑ! "". Note that this theorem does not imply that the triangular numbers are different (as in the case of 20 = 10 + 10 + 0), nor that a solution with exactly three nonzero triangular numbers must exist. This is a special case of the Fermat polygonal number theorem. The largest triangular number of the form is 4095 (see Ramanujan–Nagell equation). Wacław Franciszek Sierpiński posed the question as to the existence of four distinct triangular numbers in geometric progression. It was conjectured by Polish mathematician Kazimierz Szymiczek"
"or if numbers are lower than 2,000, attaching 一 ""ichi"" is optional. That is, 15,000,000 is read as 千五百万 ""sengohyakuman"" or 一千五百万 ""issengohyakuman"", and 1,500 as 千五百 ""sengohyaku"" or 一千五百 ""issengohyaku"". The numbers 4 and 9 are considered unlucky in Japanese: 4, pronounced ""shi"", is a homophone for ; 9, when pronounced ""ku"", is a homophone for . See tetraphobia. The number 13 is sometimes considered unlucky, though this is a carryover from Western tradition. On the contrary, numbers 7 and sometimes 8 are considered lucky in Japanese. In modern Japanese, cardinal numbers are given the ""on"" readings except 4"
"also refer to: 69 (number) 69 (sixty-nine) is a number following 68 and preceding 70. 69 is: Because 69 has an odd number of 1s in its binary representation, it is sometimes called an ""odious number."" Of note is that 69 () and 69 () together use every decimal digit from 0-9. 69 is equal to 105 octal, while 105 is equal to 69 hexadecimal. This same property can be applied to all numbers from 64 to 69. On many handheld scientific and graphing calculators, the highest factorial that can be calculated, due to memory limitations, is 69! or about"
"Numbers III 100, cent, Dec, Quadr, Quart, 4, tri, triskaidekaphobia, trivia, square, all, 9. Walk and Run Gress, Grad, Cur, Drom, Fug, Ambul 10. Water Aqua, Mar, Flu, Sea, Und, Hydr, HO, Hydra, diluv, antediluvian 11. Time Pre, Post, A.M., P.M.,chron, temp, daisy 12. Cutting Tom, sect, guillotine, atom, cis, ec, nostril 13. Animals I pecu, anim, can(cyn), mus, -ine, goose bumps, dandelion, zo, Kangaroo, impecunious, parroting, ferret, badger,Cancer, Taurus, Ares, Pisces, Leo, Scorpio, Capricorn, 14. Animals II bio, anim, drom, greg, skunk, gnu, hippodrome, gaggle, school, flock, herd, swarm, pack, colony, pride, leap, gam, crash, piggy bank, monkey wrench,"
"32 (number) 32 (thirty-two) is the natural number following 31 and preceding 33. 32 is the smallest number ""n"" with exactly 7 solutions to the equation φ(""x"") = ""n"". It is also the sum of the totient function for the first ten integers. The fifth power of two, 32 is also a Leyland number since 2 + 4 = 32. 32 is the ninth happy number. 32 = 1 + 2 + 3 In the Kabbalah, there are 32 Kabbalistic Paths of Wisdom. One of the central texts of the Pāli Canon in the Theravada Buddhist tradition, the Digha Nikaya,"
"of Fives because 2 + 3 = 5. In these works, 23 is considered lucky, unlucky, sinister, strange, sacred to the goddess Eris, or sacred to the unholy gods of the Cthulhu Mythos. The 23 enigma can be viewed as an example of apophenia, selection bias, and confirmation bias. In interviews, Wilson acknowledged the self-fulfilling nature of the 23 enigma, implying that the real value of the Law of Fives and the 23 enigma is in their demonstration of the mind's ability to perceive ""truth"" in nearly anything. In the ""Illuminatus! Trilogy"", Wilson expresses the same view, saying that one"