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A113241 Sum{k=1..n, tau(2k)-1}. 0

%I

%S 0,1,3,6,9,12,17,20,24,29,34,37,44,47,52,59,64,67,75,78,85,92,97,100,

%T 109,114,119,126,133,136,147,150,156,163,168,175,186,189,194,201,210,

%U 213,224,227,234,245,250,253,264,269,277,284,291,294,305,312,321,328

%N Sum{k=1..n, tau(2k)-1}.

%C Partial sums of A066660.

%F G.f.: (1/(1-x)) Sum_{k>0} x^k(1-x^(3k))/((1-x^k)(1-x^(2k))); a(n)=sum{k=1..n, tau(2k)}-n.

%t CoefficientList[ Series[ Sum[x^k(1 - x^(3k))/((1 - x^k)(1 - x^(2k))), {k, 60}], {x, 0, 57}]/(1 - x), x]

%K easy,nonn

%O 0,3

%A _Paul Barry_, Oct 19 2005

%E More terms from _Robert G. Wilson v_, Oct 21 2005

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)