%I #11 Jul 23 2014 10:21:17
%S 1,3,6,7,9,12,13,14,18,19,21,24,26,27,28,29,35,36,37,38,39,42,43,48,
%T 49,52,53,54,56,57,58,61,63,65,70,71,72,74,76,78,79,81,84,86,87,89,91,
%U 95,96,98,101,104,105,106,107,108,111,112,113,114,116,117,122,126,129,130,131,133,139,140,142,143,144
%N After 1, numbers whose greatest prime factor is a prime with an even index; n such that A061395(n) is even.
%C Equally, after 1, natural numbers n such that A006530(n) is in A031215.
%C A122111 maps each one of these numbers to a unique term of A028260 and vice versa.
%H Antti Karttunen, <a href="/A244990/b244990.txt">Table of n, a(n) for n = 1..10001</a>
%F For all n, A244988(a(n)) = n.
%o (Scheme, with _Antti Karttunen_'s IntSeq-library)
%o (define A244990 (MATCHING-POS 1 1 (COMPOSE even? A061395)))
%Y Complement: A244991.
%Y Cf. A006530, A028260, A031215, A061395, A122111, A244988, A244321, A244322.
%K nonn
%O 1,2
%A _Antti Karttunen_, Jul 21 2014