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A247276 Primes p such that p + m^2 is prime for all m in {2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26}. 0

%I #13 Sep 23 2014 22:55:14

%S 163,409333,13491637509487,19802478368863

%N Primes p such that p + m^2 is prime for all m in {2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26}.

%C All terms are == {7, 13} mod 30.

%C Subsequence of A247275.

%o (PARI)

%o forprime(p=1, 10^12, c=0; for(i=1, 13, if(ispseudoprime(p+(2*i)^2), c++);if(!ispseudoprime(p+(2*i)^2),break)); if(c==13, print1(p, ", "))) \\ _Derek Orr_, Sep 11 2014

%Y Cf. A049492, A092120, A246842, A247269, A145741, A247273, A247275.

%K nonn,hard,more

%O 1,1

%A _Zak Seidov_, Sep 11 2014

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Last modified February 28 08:11 EST 2024. Contains 370393 sequences. (Running on oeis4.)