# 16

This number is a composite.

Just showing those entries submitted by 'Capelle': (Click here to show all)

16 is the smallest square which is difference of two prime squares. [Capelle]

The smallest square whose reverse is prime. [Capelle]

2^{22}
is the smallest number n such that 3 + n, (3*5) + n,
(3*5*17) + n, (3*5*17*257) + n, (3*5*17*257*65537) + n are
all primes. Note that 3, 5, 17, 257 and 65537 are the known
Fermat primes, with the property
(F_{0}*F_{1}*F_{2}*...*F_{n-1})
+ 2 = F_{n} [Capelle]

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