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Search: id:A130491
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| A130491 |
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a(n) = numerator of sum{k=1 to n} k^mu(n+1-k), where mu(m) = A008683(m). |
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+0
2
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| 1, 3, 9, 35, 91, 179, 117, 1181, 14113, 1415, 14839, 35617, 85271, 53251, 3503033, 1879, 12165719, 106753, 2870239, 6436711, 46663061, 402271, 850810423, 60658043, 1473361913, 10236631, 21081760033, 39731443, 2762347887557
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OFFSET
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1,2
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COMMENT
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Denominator of sum{k=1 to n} k^mu(n+1-k) is A130492(n).
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MAPLE
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A130491 := proc(n) numer(add(k^numtheory[mobius](n+1-k), k=1..n)) ; end: seq(A130491(n), n=1..40) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 16 2007
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CROSSREFS
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Cf. A130492, A080306, A080326.
Sequence in context: A084756 A009578 A067787 this_sequence A102865 A046697 A074507
Adjacent sequences: A130488 A130489 A130490 this_sequence A130492 A130493 A130494
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KEYWORD
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frac,nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), May 29 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 16 2007
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