This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A301637 #14 Mar 27 2018 07:55:48 %S A301637 2,19,5444517870735015415413993718908291383363 %N A301637 Primes of the form 4^k + k + 1. %F A301637 a(n) = 4^(2*A301633(n)) + 2*A301633(n) + 1. %p A301637 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 %Y A301637 Primes of the form b^k+k+1: A061421 (b=2), A182327 (b=3), this sequence (b=4). %Y A301637 Cf. A301633. %K A301637 nonn %O A301637 1,1 %A A301637 _Seiichi Manyama_, Mar 25 2018