

A113241


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


0



0, 1, 3, 6, 9, 12, 17, 20, 24, 29, 34, 37, 44, 47, 52, 59, 64, 67, 75, 78, 85, 92, 97, 100, 109, 114, 119, 126, 133, 136, 147, 150, 156, 163, 168, 175, 186, 189, 194, 201, 210, 213, 224, 227, 234, 245, 250, 253, 264, 269, 277, 284, 291, 294, 305, 312, 321, 328
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OFFSET

0,3


COMMENTS

Partial sums of A066660.


LINKS

Table of n, a(n) for n=0..57.


FORMULA

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


MATHEMATICA

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


CROSSREFS

Sequence in context: A072567 A186353 A061796 * A310153 A356104 A127621
Adjacent sequences: A113238 A113239 A113240 * A113242 A113243 A113244


KEYWORD

easy,nonn


AUTHOR

Paul Barry, Oct 19 2005


EXTENSIONS

More terms from Robert G. Wilson v, Oct 21 2005


STATUS

approved



