%I
%S 1,2,2,2,1,2,1,1,0,1,1,2,1,1,0,1,1,2,1,1,0,1,1,1,0,0,0,1,1,2,1,1,0,0,
%T 0,1,1,1,0,1,1,2,1,1,0,1,1,1,0,0,0,1,1,1,0,0,0,1,1,2,1,1,0,0,0,1,1,1,
%U 0,1,1,2,1,1,0,0,0,1,1,1,0,1,1,1,0,0,0,1,1,1,0,0,0,0,0,1,1,1,0,1,1,2,1,1,0
%N a(n) = PrimePi(n+1)  PrimePi(n2).
%p A168141 := proc(n) numtheory[pi](n+1)numtheory[pi](n2) ; end proc: seq(A168141(n),n=1..120) ; # _R. J. Mathar_, Nov 19 2009
%Y Cf. A000720, A090406.
%K nonn
%O 1,2
%A _JuriStepan Gerasimov_, Nov 19 2009
