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Search: id:A131448
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| A131448 |
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Denominators of n-th approximation of factorial (also called harmonic) expansion of Euler's constant C, called gamma= 0.5772156649... |
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+0
2
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| 1, 2, 2, 24, 40, 144, 5040, 40320, 6048, 6048, 19958400, 53222400, 53222400, 87178291200, 118879488000, 5230697472000, 8083805184000, 3201186852864000, 40548366802944000, 2432902008176640000, 17030314057236480000
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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For the Havil reference and a W. Lang link see A131447.
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FORMULA
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a(n)=denominator(r(n)), with r(n):=sum(b(k)/k!,n=1..n) with b(k):= A096622(k) (factorial expansion of gamma).
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EXAMPLE
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Rationals r(n): [0, 1/2, 1/2, 13/24, 23/40, 83/144, 2909/5040, 23273/40320, 3491/6048, ...]
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CROSSREFS
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Sequence in context: A122962 A048648 A120065 this_sequence A127261 A032336 A032084
Adjacent sequences: A131445 A131446 A131447 this_sequence A131449 A131450 A131451
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KEYWORD
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nonn,frac,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Aug 07 2007
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