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 A277580 #7 Oct 24 2016 02:58:54 %S A277580 8164079,8421335,21408695,30071327,47324639,77350559,103727519, %T A277580 121538879,134151479,202767551,239875559,287432495,306871487, %U A277580 466861199,560974259,566019167,574342145,592557119,594633599,602758079,677913599,832477799 %N A277580 Numbers that are both Smith (A006753) and Lucas-Carmichael (A006972). %Y A277580 Intersection of A006753 and A006972. %K A277580 nonn,base %O A277580 1,1 %A A277580 _Max Alekseyev_, Oct 21 2016