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 A240531 #10 Sep 08 2022 08:46:07 %S A240531 3,4,7,9,10,14,16,17,18,19,24,27,29,31,34,38,39,40,41,42,44,45,47,49, %T A240531 50,51,52,54,55,56,57,58,59,62,64,66,68,69,73,74,75,76,78,79,80,81,84, %U A240531 85,87,89,92,94,95,96,99,100,101,103,104,106,107,108,109 %N A240531 Numbers n such that 24*n + 19 is not prime. %C A240531 Integer values of (2*h*k + k + h - 9)/12, with h >= k >= 1. %H A240531 Vincenzo Librandi, <a href="/A240531/b240531.txt">Table of n, a(n) for n = 1..8000</a> %t A240531 Select[Range[110], !PrimeQ[24 # + 19] &] %o A240531 (Magma) [n: n in [1..220]| not IsPrime(24*n+19)]; %Y A240531 Cf. A139532. %K A240531 nonn,easy %O A240531 1,1 %A A240531 _Vincenzo Librandi_, Apr 13 2014