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 A140380 #12 Sep 08 2022 08:45:34 %S A140380 45,87,115,129,143,171,185,213,255,297,325,339,381,395,423,437,451, %T A140380 465,493,507,535,549,591,605,633,675,689,703,717,731,745,759,801,815, %U A140380 843,871,885,899,913,927,955,969,1011,1025,1053,1067,1081,1095,1137,1165 %N A140380 Composites of the form 14k + 3. %t A140380 Select[14Range[100]+3,!PrimeQ[#]&] (* _Harvey P. Dale_, Aug 15 2011 *) %o A140380 (Magma) [(14*n+3): n in [0..100]|not IsPrime(14*n+3)] // _Vincenzo Librandi_, Dec 18 2010 %Y A140380 Cf. A045437. %K A140380 nonn,less %O A140380 1,1 %A A140380 _Juri-Stepan Gerasimov_, Jun 13 2008 %E A140380 Edited by _R. J. Mathar_, Jun 16 2008