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 A140379 #13 Sep 08 2022 08:45:34 %S A140379 1,15,57,85,99,141,155,169,183,225,253,267,295,309,323,351,365,393, %T A140379 407,435,477,505,519,533,561,575,589,603,645,687,715,729,771,785,799, %U A140379 813,841,855,869,897,925,939,981,995,1023,1037,1065,1079,1107,1121,1135 %N A140379 Nonprimes of the form 14k+1. %H A140379 Vincenzo Librandi, <a href="/A140379/b140379.txt">Table of n, a(n) for n = 1..1000</a> %t A140379 Select[14 Range[0, 100] + 1, ! PrimeQ@# &] (* _Vincenzo Librandi_, Mar 22 2014 *) %o A140379 (Magma) [a: n in [0..90] | not IsPrime(a) where a is 14*n+1]; // _Vincenzo Librandi_, Mar 22 2014 %Y A140379 Cf. A136062. %K A140379 nonn,less %O A140379 1,2 %A A140379 _Juri-Stepan Gerasimov_, Jun 13 2008 %E A140379 Edited by _R. J. Mathar_, Jun 16 2008