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 A307002 #62 Mar 05 2022 01:19:41
%S A307002 2,3,4,5,7,9,10,13,15,17,21,22,23,25,29,31,34,37,39,41,45,46,49,53,55,
%T A307002 57,58,63,65,69,71,73,77,79,81,82,85,93,94,95,97,101,105,106,109,111,
%U A307002 118,119,121,125,129,133,135,137,141,142,143,149,151,153,157
%N A307002 Numbers > 1 not of the form (3n*k - A319929(n,k))/2 where n and k > 1.
%C A307002 All even terms > 2 appear to be semiprimes of the form 6m+4 (A112774).
%C A307002 The subsequence of odd terms is A307001. - _David Lovler_, Jan 17 2022
%H A307002 David Lovler, <a href="/A307002/b307002.txt">Table of n, a(n) for n = 1..4399</a>
%o A307002 (PARI) T319929(n, k) = if (n%2, if (k%2, n+k-1, k), if (k%2, n, 0));
%o A307002 T(n, k) = (3*n*k - T319929(n, k))/2; \\ A322744
%o A307002 lista(nn) = {my(list = List()); for (n=2, nn, for (k=2, nn\n, listput(list, T(n, k)););); setminus([2..nn], Set(list));} \\ _Michel Marcus_, Jan 24 2021
%Y A307002 Cf. A112774, A307001, A322630, A322744, A340746, A340747.
%Y A307002 Third row of array A327263.
%K A307002 nonn,easy
%O A307002 1,1
%A A307002 _David Lovler_, Mar 19 2019
%E A307002 Name amended by _David Lovler_, Jan 25 2022