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Search: id:A061152
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| A061152 |
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1 + Sum_{n=1..inf} a_n x^n = Product_{n=1..inf} (1+x^n)^ithprime(n). |
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+0
4
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| 1, 2, 4, 11, 23, 51, 107, 216, 430, 839, 1614, 3046, 5684, 10465, 19046, 34321, 61225, 108245, 189779, 330093, 569916, 977139, 1664304, 2817039, 4740000, 7930740, 13198108, 21851556, 36001483, 59035979, 96373100, 156644241, 253550911
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=1/n*Sum_{k=1..n} a(n-k)*b(k), k>0, a(0)=1, b(k)=Sum_{d|k} (-1)^(k/d+1)*d*ithprime(d).
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CROSSREFS
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Cf. A007441, A007445, A030009, A061150, A061151.
Sequence in context: A072205 A026531 A038047 this_sequence A006452 A104430 A103669
Adjacent sequences: A061149 A061150 A061151 this_sequence A061153 A061154 A061155
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KEYWORD
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easy,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 16 2001
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