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Search: id:A102623
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| A102623 |
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Number of compositions into a prime number of distinct parts. |
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+0
1
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| 0, 0, 2, 2, 4, 10, 12, 18, 26, 32, 40, 52, 60, 72, 206, 218, 352, 490, 744, 1002, 1382, 1760, 2380, 3004, 3864, 4728, 5954, 12218, 13804, 20554, 27660, 39930, 52682, 75632, 99184, 132940, 172332, 227088, 287606, 373562, 465280, 587602, 725880
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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G.f.: Sum(prime(k)!*x^(1/2*prime(k)^2+1/2*prime(k))/Product(1-x^j, j = 1 .. prime(k)), k = 1 .. infinity).
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MATHEMATICA
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CoefficientList[ Series[ Sum[ Prime[k]!* x^(Prime[k]^2/2 + Prime[k]/2)/Product[1 - x^j, {j, Prime[k]}], {k, 44}], {x, 0, 44}], x] (from Robert G. Wilson v Feb 04 2005)
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CROSSREFS
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Cf. A085756, A052467, A038499.
Sequence in context: A162508 A056919 A052175 this_sequence A002082 A005304 A152732
Adjacent sequences: A102620 A102621 A102622 this_sequence A102624 A102625 A102626
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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), Jan 31 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 04 2005
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