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 A153129 #15 Sep 08 2022 08:45:39 %S A153129 2,5,8,9,10,11,14,15,16,17,20,23,25,26,27,29,30,31,32,35,37,38,40,41, %T A153129 42,44,45,47,50,51,53,54,55,56,58,59,60,61,62,64,65,66,68,70,71,72,73, %U A153129 74,75,77,78,79,80,83,85,86,89,90,92,93,95,97,98,100 %N A153129 Numbers n such that 8*n + 5 is not prime. %H A153129 Vincenzo Librandi, <a href="/A153129/b153129.txt">Table of n, a(n) for n = 1..1000</a> %e A153129 *; %e A153129 *, *; %e A153129 2, *, *; %e A153129 *, 5, *, *; %e A153129 *, *, 9, *, *; %e A153129 *, *, *, 14, *, *; %e A153129 5, *, *, *, 20, *, *; %e A153129 *, 10, *, *, *, 27, *, *; %e A153129 *, *, 16, *, *, *, 35, *, *; %e A153129 where * marks the non-integer values of (2*n*k + k + n - 2)/4 with n >= k >= 1. - _Vincenzo Librandi_, Nov 30 2012 %t A153129 Select[Range[200], !PrimeQ[8# + 5] &] (* _Vincenzo Librandi_, Nov 30 2012 *) %o A153129 (Magma) [n: n in [1..120] | not IsPrime(8*n + 5)]; // _Vincenzo Librandi_, Nov 30 2012 %Y A153129 Cf. A105133. %K A153129 nonn,easy %O A153129 1,1 %A A153129 _Vincenzo Librandi_, Dec 19 2008