11

This number is a prime.

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

+ The smallest two-digit additive prime (a prime whose sum of digits is prime). [Russo]

+ The smallest prime p such that 2p - 1 is composite. [Russo]

+ The smallest multidigit Lucasian prime: p is congruent to 3 (mod 4) with 2p+1 prime. [Russo]

+ The smallest prime p such that 6*p-1 is composite. [Russo]

+ The smallest palindromic prime p such that 2^p-1 has at most 2 prime factors. [Russo]

+ The smallest strong prime. A strong prime is a prime that is greater than the arithmetic mean of the nearest prime above and below. [Russo]

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