A301637 - OEIS

A301637

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

2, 19, 5444517870735015415413993718908291383363

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OFFSET

1,1

LINKS

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).

KEYWORD

nonn

AUTHOR

STATUS

approved