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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
 163, 409333, 13491637509487, 19802478368863 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are == {7, 13} mod 30. Subsequence of A247275. LINKS Table of n, a(n) for n=1..4. PROG (PARI) 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 CROSSREFS Cf. A049492, A092120, A246842, A247269, A145741, A247273, A247275. Sequence in context: A145741 A247273 A247275 * A127882 A240255 A045006 Adjacent sequences: A247273 A247274 A247275 * A247277 A247278 A247279 KEYWORD nonn,hard,more AUTHOR Zak Seidov, Sep 11 2014 STATUS approved

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Last modified November 29 17:22 EST 2023. Contains 367445 sequences. (Running on oeis4.)