%I #11 Nov 26 2013 04:30:37
%S 2,4,6,7,9,12,16,18,21,22,24,27,30,36,37,39,42,46,48,51,57,60,66,67,
%T 69,72,81,87,90,102,106,108,111,120,121,123,126,132,135,141,150,156,
%U 165,171,172,174,177,186,192,207,210
%N Numbers of the form ((p^2 + q^2)/2  1)/4, where p and q are odd primes.
%C a(n) mod 3 = 0 if neither prime = 3.
%C a(n) mod 3 = 1 if one prime = 3.
%C a(1) mod 3 = 2 (where both primes = 3).
%F a(n) = (A143850(n)1)/4.
%K nonn
%O 1,1
%A _Richard R. Forberg_, Sep 22 2013
