%I
%S 2,3,3,7,11,15,21,27,31,34,39,45,51,55,60,63,68,75,78,83,87,100,103,
%T 109,119,125,130,133,138,144,154,159,171,182,185,189,195,205,209,214,
%U 220,226,230,239,252,256,260,273,278,287,291,296,303,308,313,315,320,327
%N nth single or isolated number minus nth nonsingle or nonisolated number.
%F a(n)=A167706(n)A167707(n).
%e a(1)=20=2, a(2)=41=3, a(3)=63=3, a(4)=125=7.
%Y Cf. A167706, A167707.
%K nonn
%O 1,1
%A _JuriStepan Gerasimov_, Nov 14 2009
%E All numbers > 68 corrected by _R. J. Mathar_, May 30 2010
