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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
OFFSET
1,1
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
KEYWORD
nonn,more
AUTHOR
Pierre CAMI, Oct 27 2014
STATUS
approved