A249384 Smallest odd prime number Q such that Q*2^P+1 is also prime, where P is a Mersenne prime exponent A000043(n).

3, 5, 3, 5, 5, 53, 11, 239, 53, 191, 1229, 5, 233, 347, 1367, 9767, 2063, 89, 14009, 3329, 19991, 50849, 2711, 337871, 46301, 2543, 413093, 1157111, 615161, 1138649, 3778427

Offset

1,1

Links

Table of n, a(n) for n=1..31.

Prog

(PARI) lista(nn) = {vmp = readvec("b000043.txt"); for (n=1, nn, k=2; while(!isprime(prime(k)*2^vmp[n]+1), k++); print1(prime(k), ", "); ); } \\ Michel Marcus, Oct 27 2014

Crossrefs

Cf. A000043, A249382, A249383.

Sequence in context: A112756 A121795 A253027 * A228446 A364564 A188889

Adjacent sequences: A249381 A249382 A249383 * A249385 A249386 A249387

Keyword

nonn,more

Author

Pierre CAMI, Oct 27 2014

Status

approved