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%I #4 May 24 2021 15:48:18
%S 0,0,0,0,4,4,10,10,10,19,29,29,29,29,43,58,58,58,58,58,58,79,101,101,
%T 101,126,152,152,152,152,152,152,152,185,219,254,254,254,292,331,331,
%U 331,331,331,331,331,377,377,377,426,426,477,477,477,477,532,532,589
%N Sum of the semiprimes <= n.
%C This is to semiprimes A001358 as A034387 is to primes A000040. From the prime number theorem A034387(n) has the asymptotic expression: a(n) ~ n^2 / (2 log n), so what is the asymptotic expression for a(n)?
%F a(n) = Sum_{j such that j is in A001358 and j<=n} = A062198(A072000(n)).
%Y Cf. A001358, A034387, A051352, A062198, A072000, A100959, A140235.
%K easy,nonn
%O 0,5
%A _Jonathan Vos Post_, May 13 2008
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