A191617 Least number a such that (2^n+a)*2^n + 1 is a prime number

0, 0, 1, 0, 4, 3, 12, 0, 1, 3, 6, 6, 16, 9, 4, 5, 3, 20, 6, 5, 4, 5, 21, 9, 16, 35, 6, 6, 18, 8, 28, 6, 46, 11, 39, 6, 3, 20, 22, 47, 93, 90, 13, 51, 27, 98, 34, 6, 12, 14, 21, 21, 49, 143, 18, 5, 58, 30, 37, 30, 6, 56, 16, 150, 72, 59, 12, 5, 34, 3, 28, 45

Offset

1,5

Links

Pierre CAMI, Table of n, a(n) for n = 1..5000

Mathematica

Table[a = 0; While[! PrimeQ[(2^n + a)*2^n + 1], a++]; a, {n, 100}] (* T. D. Noe, Jun 11 2011 *)

Crossrefs

Cf. A191618, A191619, A191620, A191621.

Sequence in context: A072802 A093726 A126604 * A169704 A270094 A270736

Adjacent sequences: A191614 A191615 A191616 * A191618 A191619 A191620

Keyword

nonn

Author

Pierre CAMI, Jun 09 2011

Status

approved