119 number - In mathematics: Encyclopedia II - 13 number - In mathematicsThirteen 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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