208

This number is a composite.

+ 208 = 22 + 32 + 52 + 72 + 112. [Sladcik]

+ 208^0 + 208^1 + 208^2 + 208^3 + ... + 208^35 + 208^36 is a prime number. [Raghava]

+ Smallest positive integer k>=2 such that no primes of the form (k+1)*k^n-1 with positive integer n are known. [Luen]

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