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 A102458 #3 Mar 30 2012 18:35:42 %S A102458 2,152,158,338,368,380,524,542,548,608,614,662,674,692,998,1052,1094, %T A102458 1110,1154,1182,1202,1238,1292,1322,1328,1472,1532,1544,1598,1622, %U A102458 1628,1664,1862,1934,1952,2018,2030,2084,2132,2240,2340,2342,2352,2468,2474 %N A102458 Numbers n with A102457(n) != lpf(n-1) (lpf = least prime factor). %Y A102458 Cf. A102457, A102459. %K A102458 nonn %O A102458 1,1 %A A102458 _David W. Wilson_, Jan 09 2005