See also Thirteen, a 2003 movie, 13 an album by British band Blur, Thirteen an album by Teenage Fanclub. 13 (thirteen) is the natural number following 12 and preceding 14. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 13 number - In mathematics. Thirteen is the 6th smallest prime number; the next is seventeen. 13 is the second Wilson prim ...

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Thirteen is regarded as an unlucky number in many cultures. One (probably unverifiable) theory holds that 13 is a reflection of the human fear of the unknown, since it is the first number that cannot be enumerated by using our 10 fingers and 2 feet. Unreasoned fear of the number 13 is termed triskaidekaphobia. Due to this fear, some tall buildings have resorted to skipping the "thirteenth floor", simply by numbering it "14" (though it's really still the thirteenth floor) or by designating the floor "12a" or similar instead. The thirteenth of ...

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Thirteen is regarded as an unlucky number in many cultures. One (probably unverifiable) theory holds that 13 is a reflection of the human fear of the unknown, since it is the first number that cannot be enumerated by using our 10 fingers and 2 feet. Unreasoned fear of the number 13 is termed triskaidekaphobia. Due to this fear, some tall buildings have resorted to skipping the "thirteenth floor", simply by numbering it "14" (though it's really still the thirteenth floor) or by designating the floor "12a" or similar instead. The thirteenth of ...

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Thirteen is the 6th smallest prime number; the next is seventeen. 13 is the second Wilson prime. 13 is the fifth Mersenne prime exponent, yielding 8191. 13 is also the third lucky prime. 13 is the second star number and the seventh Fibonacci number. As it is an odd-indexed Fibonacci number, it is a Markov number, appearing in solutions to the Markov Diophantine equation: (1, 5, 13), (1, 13, 34), (5, 13, 194), ... There are 13 Archimedean solids. 13 goes into 999,999 exactly 76,923 times, so vulgar fractions with 13 in the denominator have six digit repe ...

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See also Thirteen, a 2003 movie, 13 an album by British band Blur, Thirteen an album by Teenage Fanclub. 13 (thirteen) is the natural number following 12 and preceding 14. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 13 number - In mathematics. Thirteen is the 6th smallest prime number; the next is seventeen. 13 is the second Wilson prim ...

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A superstition is an irrational or invalid belief about the relation between certain actions (often behaviors) and other actions that is not true, such as fear of the number 13. The essence of superstition is not defined by the "truth" of the result, however, but recognized by the methods through which truth is searched for. The superstitious individual erroneously believes that the future, or the outcome of certain events can be caused or influenced by certain specified behaviors, despite the lack of a causal relationship in r ...

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56 is the sum of the first six triangular numbers (making it a tetrahedral number), as well as the sum of six consecutive primes (3 + 5 + 7 + 11 + 13 + 17). It is also a tetranacci number and a pronic number. The maximum determinant in an 8 by 8 matrix of zeroes and ones is 56. ...

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The Old Testament contains a variety of health related instructions, such as isolating infected people (Leviticus 13:45-46), washing after handling a dead body (Numbers 19:11-19), and burying excrement away from a camp (Deuteronomy 23:12-13). Believers of Biblical inspiration contend that the degree of effectiveness of the Mosaic dietary restrictions and hygienic strictures indicates that the knowledge in the Old Testament is somet ...

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10 (ten) is the natural number following 9 and preceding 11. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> deci- (from Latin) 10 number - In mathematics. Ten is a composite number, its proper divisors being 1, 2 and 5. Ten is the smallest noncototient, a number that can not be expressed as the difference between any integer and ...

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18 (eighteen) is the natural number following 17 and preceding 19. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 18 number - In mathematics. Eighteen is a composite number, its proper divisors being 1, 2, 3, 6 and 9. It is a heptagonal number, and as the sum of the first three pentagonal numbers, it is a pentagonal pyramidal number. It is a Harshad num ...

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19 (nineteen) is the natural number following 18 and preceding 20. It is a prime number. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 19 number - In mathematics. Nineteen is the 8th smallest prime number. The sequence continues 23, 29, 31, 37... 19 is the seventh Mersenne prime exponent. It is also a Keith number, because it recurs in a Fibonac ...

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<< 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 12 (twelve) is the natural number following 11 and preceding 13. A group of twelve things is called a Duodecad. 12 number - In mathematics. Twelve is a composite number, the smallest number with exactly six divisors, its proper divisors being 1, 2, 3, 4 and 6. Twelve is also a highly composite ...

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14 (fourteen) is the natural number following 13 and preceding 15. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 14 number - In mathematics. Fourteen is a composite number, its proper divisors being 1, 2 and 7. In base fifteen and higher bases (such as hexadecimal), fourteen is represented as E. Fourteen is the sum of the first th ...

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11 (eleven) is the natural number following 10 and preceding 12. Eleven is the smallest positive integer requiring three syllables in English. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 11 number - In mathematics. Eleven is the 5th smallest prime number. 11 is the fourth Sophie Germain prime, the third safe prime, the fourth Lucas prime, and the fir ...

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16 (sixteen) is the natural number following 15 and preceding 17. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 16 number - In The United States of America. Sixteen is a turning point age for young Americans. Not only do American sixteen year olds gain the ability to aquire an official driver's license, but female sixteen year olds also gain privacy la ...

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17 (seventeen) is the natural number following 16 and preceding 18. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 17 number - In mathematics. Seventeen is the 7th prime number. The next prime is nineteen, with which it comprises a twin prime. 17 is the sum of the first four primes. 17 is the sixth Mersenne prime exponent, yielding 131071. 17 is an Eise ...

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One hundred four is a primitive semiperfect number and a composite number, with its divisors being 2, 4, 8, 13, 26 and 52. In regular geometry, 104 is the smallest number of unit line segments that can exist in a plane with four of them touching at every vertex. ...

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Seventy-two is the sum of four consecutive primes (13 + 17 + 19 + 23), as well as the sum of six consecutive primes (5 + 7 + 11 + 13 + 17 + 19). 72 is a Harshad number and a pronic number. In normal space, the exterior angles of an equilateral pentagon measure 72 degrees each. There are 17 solutions to the equation φ(x) = 72, more than any integer below 72, making it a highly totient number. ...

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The atomic number of magnesium In astronomy, Messier object M12, a magnitude 8.0 globular cluster in the constellation Ophiuchus The New General Catalogue object NGC 12, a magnitude 13.1 spiral galaxy in the constellation Pisces The Saros number of the solar eclipse series which began on -2680 August 8 and ended on -1129 February 25. The duration of Saros series 12 was 1550.5 years, and it contained 87 solar eclipses. The Saros number of the lunar eclipse ...

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