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 A189242 #16 Sep 08 2022 08:45:56 %S A189242 2,6,7,8,12,13,15,17,19,20,22,27,28,29,30,32,34,37,41,42,44,46,47,48, %T A189242 51,52,54,55,57,60,62,63,65,67,68,69,72,73,74,75,76,77,80,81,82,83,84, %U A189242 85,87,90,91,92,93,96,97,98,102,103,104,105,106,107,111,112,117,118 %N A189242 Numbers n such that 24*n+17 is not prime. %H A189242 Vincenzo Librandi, <a href="/A189242/b189242.txt">Table of n, a(n) for n = 1..1000</a> %e A189242 Distribution of the terms in the following triangular array: %e A189242 *; %e A189242 *,*; %e A189242 *,*,*; %e A189242 *,*,*,*; %e A189242 *,*,*,*,*; %e A189242 *,2,*,*,*,*; %e A189242 *,*,*,*,*,*,*; %e A189242 *,*,*,*,*,*,*,*; %e A189242 *,*,*,*,8,*,*,*,*; %e A189242 *,*,*,*,*,*,*,*,*,*; %e A189242 *,*,6,*,*,*,*,*,*,*,*; %e A189242 *,*,*,*,*,*,*,17,*,*,*,*; etc. %e A189242 where * marks the non-integer values of (2*h*k + k + h - 8)/12 with h >= k >= 1. - _Vincenzo Librandi_, Jan 15 2013 %t A189242 Select[Range[1,300],!PrimeQ[24 # + 17] &] (* _Vincenzo Librandi_, Aug 05 2012 *) %o A189242 (Magma) [n: n in [0..200] | not IsPrime(24*n+17)]; // _Vincenzo Librandi_, Apr 19 2011 %Y A189242 Cf. A139531, A107181. %K A189242 nonn,easy %O A189242 1,1 %A A189242 _Vincenzo Librandi_, Apr 19 2011