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A249383 Smallest odd prime number Q such that Q*2^P-1 is also prime with P Mersenne prime exponent A000043(n). 2
3, 3, 7, 3, 31, 7, 61, 43, 79, 19, 739, 103, 2707, 4513, 139, 13, 4027, 28027, 14029, 87151, 11257, 8677, 122449, 104161, 113287, 216211, 150097, 862009, 876721, 414949, 4590451, 1391281 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(32) is a 227838-digit certified prime.

Does a(n) exist for each n? - Charles R Greathouse IV, Oct 28 2014

LINKS

Table of n, a(n) for n=1..32.

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, A249384.

Sequence in context: A324048 A100587 A324548 * A187419 A099282 A002937

Adjacent sequences:  A249380 A249381 A249382 * A249384 A249385 A249386

KEYWORD

nonn

AUTHOR

Pierre CAMI, Oct 27 2014

STATUS

approved

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Last modified February 27 04:56 EST 2020. Contains 332299 sequences. (Running on oeis4.)