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A081543 G.f.: sum(k>=1,x^k/(1-x^k)^(k+1)). +0
1
1, 3, 4, 8, 6, 17, 8, 24, 20, 32, 12, 76, 14, 51, 72, 97, 18, 158, 20, 213, 142, 101, 24, 491, 152, 132, 248, 479, 30, 915, 32, 681, 398, 206, 828, 1859, 38, 249, 600, 2560, 42, 2692, 44, 1686, 2864, 347, 48, 6166, 1766, 3405 (list; graph; listen)
OFFSET

0,2

FORMULA

If p is prime then a(p)=p+1

PROGRAM

(PARI) a(n)=if(n<1, 0, polcoeff(sum(k=1, n, 1/(1-x^k)^k, x*O(x^(n^2))), n))

CROSSREFS

Sequence in context: A129283 A079787 A081307 this_sequence A105753 A019972 A064406

Adjacent sequences: A081540 A081541 A081542 this_sequence A081544 A081545 A081546

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 21 2003

EXTENSIONS

Description corrected by Vladeta Jovovic (vladeta(AT)Eunet.yu), Aug 22 2003

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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