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 A048464 #10 Jun 19 2021 02:42:31 %S A048464 9,11,17,18,21,22,23,24,29,32,33,35,36,38,39,40,48,49,50,54,56,57,58, %T A048464 65,66,67,69,70,72,74,76,77,78,79,81,83,85,86,88,89,91,93,95,96,97,99, %U A048464 100,101,106,107,108,110,111,113,114,115,121,125,126,128,129 %N A048464 Indices of primefree generations. %Y A048464 For "Generations" see A048448-A048455. See also A047844. %K A048464 nonn %O A048464 1,1 %A A048464 _Patrick De Geest_, May 15 1999 %E A048464 More terms from _Sean A. Irvine_, Jun 18 2021