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A301637 Primes of the form 4^k + k + 1. 1
2, 19, 5444517870735015415413993718908291383363 (list; graph; refs; listen; history; text; internal format)
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: A091688 A306207 A073444 * A210416 A220943 A082259

Adjacent sequences:  A301634 A301635 A301636 * A301638 A301639 A301640

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Mar 25 2018

STATUS

approved

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Last modified January 20 07:59 EST 2020. Contains 331081 sequences. (Running on oeis4.)