15
This number is a composite.
Just showing those entries submitted by 'Capelle': (Click here to show all)
15 is the smallest number which is product of two distinct odd primes. [Capelle]
The only known natural number n > 0 such that the sum of
the five known Fermat primes raised to the power n is
prime. Curiously, it is the product of the first two Fermat
primes. [Capelle]
The number of supersingular primes, i.e., primes that
divide the order of the Monster group (an algebraic
construction with 246 *
320 *
59 *
76 *
112 *
133 * 17 * 19 * 23 * 29 * 31 *
41 * 47 * 59 * 71 elements). [Capelle]
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