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 A090563 #24 Apr 14 2025 05:36:26
%S A090563 1,2,3,4,5,6,7,11,13,14,15,16,17,19,21,22,24,25,26,30,32,35,36,38,43,
%T A090563 44,49,52,54,55,60,61,62,63,66,69,70,71,73,74,79,80,81,82,85,87,88,93,
%U A090563 94,101,104,106,107,109,110,112,114,115,117,123,127,128,131,135
%N A090563 Numbers k such that 5*k^2 + 5*k + 1 is prime.
%H A090563 Robert Price, <a href="/A090563/b090563.txt">Table of n, a(n) for n = 1..2468</a>
%t A090563 Do[s=5*n^2+5*n+1; If[PrimeQ[s], Print[n]], {n, 1, 1000}]
%t A090563 Select[Range[1000], PrimeQ[5 #^2 + 5 # + 1] &] (* _Robert Price_, Apr 13 2025 *)
%o A090563 (PARI) isok(n) = isprime(5*n^2+5*n+1); \\ _Michel Marcus_, Apr 30 2016
%Y A090563 Cf. A090562.
%K A090563 nonn
%O A090563 1,2
%A A090563 _Amarnath Murthy_, Dec 11 2003
%E A090563 More terms from _Labos Elemer_, Dec 12 2003
%E A090563 Offset corrected by _Arkadiusz Wesolowski_, Aug 09 2011