A240105 Integers n such that 2n^k + 1, for k = 2..7, are prime.

1, 3490575, 83972646, 414180489, 476072025, 1881147720, 3020243916, 3188924769, 3285167214, 3543143220

Offset

1,2

Comments

First n>1 such that 2n^k+1, for k=2..8, are prime, is a(3) = 83972646.

Subsequence of A240099: a(2) = 3490575 = A240099(4), a(3) = 83972646 = A240099(22).

Links

Table of n, a(n) for n=1..10.

Crossrefs

Cf. A089001, A168550, A239874, A239925, A240099.

Sequence in context: A349065 A204335 A365888 * A205766 A183790 A256770

Adjacent sequences: A240102 A240103 A240104 * A240106 A240107 A240108

Keyword

nonn,more

Author

Zak Seidov, Apr 01 2014

Status

approved