A301637 Primes of the form 4^k + k + 1.

2, 19, 5444517870735015415413993718908291383363

Offset

1,1

Links

Table of n, a(n) for n=1..3.

Formula

a(n) = 4^(2*A301633(n)) + 2*A301633(n) + 1.

Maple

a:=n->`if`(isprime(4^k+k+1), 4^k+k+1, NULL): seq(a(k), k=0..300); # Muniru A Asiru, Mar 25 2018

Crossrefs

Primes of the form b^k+k+1: A061421 (b=2), A182327 (b=3), this sequence (b=4).

Cf. A301633.

Sequence in context: A306207 A355466 A073444 * A366333 A366331 A210416

Adjacent sequences: A301634 A301635 A301636 * A301638 A301639 A301640

Keyword

nonn

Author

Seiichi Manyama, Mar 25 2018

Status

approved