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 A118019 #7 Feb 16 2025 08:33:00 %S A118019 2,1454252568471818731501051 %N A118019 Prime complementary Bell numbers (in absolute value). %C A118019 Next term has index 723 and 1266 decimal digits %H A118019 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ComplementaryBellNumber.html">Complementary Bell Number</a> %Y A118019 Cf. A000587, A118018. %K A118019 nonn,bref %O A118019 1,1 %A A118019 _Eric W. Weisstein_, Apr 10 2006