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%I #3 Jun 19 2021 14:08:04
%S 0,0,0,4,0,4,0,4,4,4,0,8,0,4,4,0,0,8,0,8,4,4,0,8,4,4,4,8,0,12,0,0,4,4,
%T 4,8,0,4,4,8,0,12,0,8,8,4,0,4,4,8,4,8,0,8,4,8,4,4,0,16,0,4,8,0,4,12,0,
%U 8,4,12,0,8,0,4,8,8,4,12,0,4,0,4,0,16,4,4,4,8,0,16
%N Sum of the semiprime divisors of n whose square does not divide n.
%C a(p) = 0 for p prime.
%F a(n) = Sum_{d|n, d^2 does not divide n} d * [Omega(d) = 2], where [ ] is the Iverson bracket.
%Y Cf. A001358.
%K nonn
%O 1,4
%A _Wesley Ivan Hurt_, Jun 19 2021
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