%I #10 Jun 06 2021 15:57:04
%S 3,4,2,1,3,1224,551,1,697,66,60,31,12,7,24641820,3343240,122610,134,4,
%T 101,80,1,979,518,1414
%N a(n) = (A128677(n) - 1)/(2*A000040(n)).
%C All terms are integer since for n > 1, p = A000040(n) divides (A128677(n)-1)/2.
%F a(n) = (A128677(n) - 1)/(2*A000040(n)).
%e a(2) = (A128677(2) - 1)/(2*A000040(2)) = (19 - 1)/(2*3) = 3.
%Y Cf. A128677, A127263, A128678, A128679, A128680, A128681, A128682, A128683, A128684, A128685.
%K nonn,more
%O 2,1
%A _Alexander Adamchuk_, Dec 27 2007
%E a(16)-a(26) from _Max Alekseyev_, May 14 2010