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 A177091 #6 Sep 08 2022 08:45:53 %S A177091 3,8,10,12,14,15,17,18,19,21,22,24,25,27,28,29,30,31,32,33,34,35,36, %T A177091 37,38,41,43,45,46,47,48,49,51,52,54,56,58,59,62,63,64,65,66,67,69,70, %U A177091 72,73,74,75,76,78,80,81,83,84,85,86,87,88,89,90,91,93,94,95,96,97,98,99 %N A177091 Numbers n such that n^4-n-1 is not prime. %H A177091 Vincenzo Librandi, <a href="/A177091/b177091.txt">Table of n, a(n) for n = 1..1000</a> %t A177091 Select[Range[2, 100], !PrimeQ[#^4 - # - 1] &] (* _Vincenzo Librandi_, Oct 15 2012 *) %o A177091 (Magma) [n: n in [2..100] |not IsPrime(n^4 - n - 1)]; // _Vincenzo Librandi_, Oct 15 2012 %Y A177091 Cf. A126424 (Numbers n for which n^4-n-1 is prime) %K A177091 nonn,easy %O A177091 1,1 %A A177091 _Vincenzo Librandi_, Jun 25 2010