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 A217129 #8 Sep 08 2022 08:46:04 %S A217129 3,5,7,8,9,10,11,12,13,14,15,17,18,19,21,22,23,25,26,27,29,30,31,32, %T A217129 33,35,36,37,38,39,40,41,42,43,44,45,47,49,50,51,52,53,55,57,58,59,60, %U A217129 61,62,63,64,65,66,67,68,69,70,71,72,73,75,76,77,78,79,81,83 %N A217129 Numbers n such that n^4 + 1 is not prime. %H A217129 Vincenzo Librandi, <a href="/A217129/b217129.txt">Table of n, a(n) for n = 1..1000</a> %t A217129 Select[Range[100], ! PrimeQ[#^4 + 1] &] %o A217129 (Magma) [n: n in [1..100] |not IsPrime(n^4+1)]; %Y A217129 Cf. A000068, A037896. %K A217129 nonn,easy %O A217129 1,1 %A A217129 _Vincenzo Librandi_, Sep 27 2012