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 A153348 #10 Sep 08 2022 08:45:39 %S A153348 2,3,6,7,9,12,15,16,17,18,20,21,22,23,24,25,27,28,30,32,33,36,37,38, %T A153348 39,42,44,45,47,48,50,51,52,53,54,56,57,58,60,61,62,63,64,65,66,67,69, %U A153348 71,72,75,76,77,78,79,81,82,83,84,85,86,87,88,90,92,93,94 %N A153348 Numbers n such that 16*n+3 is not prime. %H A153348 Vincenzo Librandi, <a href="/A153348/b153348.txt">Table of n, a(n) for n = 1..1000</a> %e A153348 Triangle begins: %e A153348 *; %e A153348 *,*; %e A153348 *,2,*; %e A153348 *,*,*,*; %e A153348 *,*,*,6,*; %e A153348 *,*.*,*,*,*; %e A153348 *,*,*,*,*,12,*; %e A153348 3,*,*,*,*,*,*,*; %e A153348 *,*,*,*,*,*,*,20,*; %e A153348 *,*,9,*,*,*,*,*,*,*; %e A153348 *,7,*,*,*,*,*,*,*,30,*; %e A153348 *,*,*,*,17,*,*,*,*,*,*,*; %e A153348 where * marks the non-integer values of (2*h*k + k + h - 1)/8 with h >= k >= 1. %t A153348 Select[Range[200], !PrimeQ[16*# + 3]&] (* _Vincenzo Librandi_, Jan 13 2013 *) %o A153348 (Magma) [n: n in [0..150] | not IsPrime(16*n + 3)]; // _Vincenzo Librandi_, Jan 13 2013 %Y A153348 Cf. A092022. %K A153348 nonn,easy %O A153348 1,1 %A A153348 _Vincenzo Librandi_, Dec 24 2008