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 A140370 #8 Sep 08 2022 08:45:34 %S A140370 21,99,125,177,203,255,333,385,411,437,489,515,567,645,671,697,723, %T A140370 749,775,801,879,905,931,957,1035,1113,1139,1165,1191,1243,1269,1295, %U A140370 1347,1425,1477,1503,1529,1555,1581,1633,1659,1685,1711,1737,1763,1815,1841 %N A140370 Composites of the form 26k + 21. %o A140370 (Magma) [(26*n+21): n in [0..100]|not IsPrime(26*n+21)] // _Vincenzo Librandi_, Dec 18 2010 %Y A140370 Cf. A092178. %K A140370 nonn,less %O A140370 1,1 %A A140370 _Juri-Stepan Gerasimov_, Jun 14 2008 %E A140370 Edited by _R. J. Mathar_, Jun 16 2008