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 A228358 #12 Sep 08 2022 08:46:05 %S A228358 1,4,6,8,10,12,13,14,16,18,20,22,23,24,26,27,28,30,32,33,34,36,38,40, %T A228358 41,42,43,44,46,48,49,50,52,53,54,55,56,58,60,62,63,64,66,68,69,70,71, %U A228358 72,73,74,75,76,78,80,82,83,84,86,88,90,92,93,94,96,97,98,100,101 %N A228358 Numbers n such that 3*n - 4 is not prime. %C A228358 After 1, all terms are given by A153170 +2. [_Bruno Berselli_, Aug 21 2013] %H A228358 Vincenzo Librandi, <a href="/A228358/b228358.txt">Table of n, a(n) for n = 1..1000</a> %e A228358 8 is in the sequence since 3*8 - 4 = 20 is not prime. %t A228358 Select[Range[230], ! PrimeQ[3 # - 4]&] %o A228358 (Magma) [n: n in [1..120] | not IsPrime(3*n -4)]; %Y A228358 Cf. A153170, A228121. %K A228358 nonn,easy %O A228358 1,2 %A A228358 _Vincenzo Librandi_, Aug 21 2013