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 A166570 #13 Sep 08 2022 08:45:48 %S A166570 2,7,9,11,12,16,17,22,23,24,26,27,30,32,33,37,42,43,44,45,47,50,51,52, %T A166570 55,57,58,60,62,63,64,65,66,67,70,72,74,76,77,79,82,83,86,87,88,89,92, %U A166570 93,94,97,99,100,102,103,105,107,110,111,112,114,115,116,117,121,122 %N A166570 Numbers n such that 12*n+11 is not prime. %H A166570 Vincenzo Librandi, <a href="/A166570/b166570.txt">Table of n, a(n) for n = 1..1000</a> %e A166570 Distribution of the terms in the following triangular array: %e A166570 *; %e A166570 *,*; %e A166570 *,2,*; %e A166570 *,*,*,*; %e A166570 *,*,*,*,*; %e A166570 *,*,*,*,11,*; %e A166570 *,*,*,*,*,*,*; %e A166570 *,*,9,*,*,*,*,*; %e A166570 *,7,*,*,*,*,*,26,*; %e A166570 *,*,*,*,*,*,*,*,*,*; %e A166570 *,*,*,*,*,24,*,*,*,*,*; %e A166570 *,*,*,*,22,*,*,*,*,*,47,*; etc. %e A166570 where * marks the non-integer values of (2*h*k + k + h - 5)/6 with h >= k >= 1. - %t A166570 Select[Range[0, 200], !PrimeQ[12 # + 11] &] (* _Vincenzo Librandi_, Jan 14 2013 *) %o A166570 (Magma) [n: n in [0..150] | not IsPrime(12*n+11)]; // _Vincenzo Librandi_, Jan 14 2013 %Y A166570 Cf. A167057. %K A166570 nonn,easy %O A166570 1,1 %A A166570 _Vincenzo Librandi_, Oct 29 2009