OFFSET
1,1
COMMENTS
All even terms > 2 appear to be semiprimes of the form 6m+4 (A112774).
The subsequence of odd terms is A307001. - David Lovler, Jan 17 2022
LINKS
David Lovler, Table of n, a(n) for n = 1..4399
PROG
(PARI) T319929(n, k) = if (n%2, if (k%2, n+k-1, k), if (k%2, n, 0));
T(n, k) = (3*n*k - T319929(n, k))/2; \\ A322744
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
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
David Lovler, Mar 19 2019
EXTENSIONS
Name amended by David Lovler, Jan 25 2022
STATUS
approved