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A014973
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n/GCD(n,(n-1)!).
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3
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1, 2, 3, 2, 5, 1, 7, 1, 1, 1, 11, 1, 13, 1, 1, 1, 17, 1, 19, 1, 1, 1, 23, 1, 1, 1, 1, 1, 29, 1, 31, 1, 1, 1, 1, 1, 37, 1, 1, 1, 41, 1, 43, 1, 1, 1, 47, 1, 1, 1, 1, 1, 53, 1, 1, 1, 1, 1, 59, 1, 61, 1, 1, 1, 1, 1, 67, 1, 1, 1, 71, 1, 73, 1, 1, 1, 1, 1, 79, 1, 1, 1, 83, 1, 1, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Denominator in n!/n^2. Also denominator in Taylor series expansion of dilog function (also called Li_2). - Ralf Stephan, Mar 28 2004
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FORMULA
| a(4) = 2; otherwise a(n) = 1 unless n is a prime in which case a(n) = n. - Ola Veshta (olaveshta(AT)my-deja.com), May 30 2001.
a(n) = denominator((i-1)! * sum(i=1, n, 1 - 1/i)) - Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 16 2004
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CROSSREFS
| Sequence in context: A130069 A120007 A092509 * A157753 A020500 A014963
Adjacent sequences: A014970 A014971 A014972 * A014974 A014975 A014976
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KEYWORD
| nonn
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AUTHOR
| Marc LeBrun (mlb(AT)well.com)
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