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A249384 Smallest odd prime number Q such that Q*2^P+1 is also prime, where P is a Mersenne prime exponent A000043(n). 2
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 (list; graph; refs; listen; history; text; internal format)
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 A188889 A219604

Adjacent sequences:  A249381 A249382 A249383 * A249385 A249386 A249387

KEYWORD

nonn,more

AUTHOR

Pierre CAMI, Oct 27 2014

STATUS

approved

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Last modified November 14 10:20 EST 2019. Contains 329111 sequences. (Running on oeis4.)