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 A123215 #12 Sep 08 2022 08:45:28 %S A123215 0,1,2,3,4,13,112 %N A123215 Duplicate of A051855. %t A123215 Select[Range[200], PrimeQ[#!^4 + 1] &] %o A123215 (Magma)[ n: n in [0..300] | IsPrime((Factorial(n)^4)+1)] // _Vincenzo Librandi_, Dec 22 2010 %K A123215 dead %O A123215 1,3 %A A123215 _Jonathan Vos Post_, Oct 05 2006 %E A123215 a(7) from _Vincenzo Librandi_, Dec 22 2010