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Search: id:A020475
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| A020475 |
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a(n) is number of k for which C(n,k) is divisible by n. |
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+0
8
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| 0, 2, 1, 2, 2, 4, 2, 6, 4, 6, 6, 10, 5, 12, 6, 8, 8, 16, 10, 18, 10, 14, 14, 22, 10, 20, 18, 18, 14, 28, 11, 30, 16, 26, 30, 26, 22, 36, 30, 30, 22, 40, 20, 42, 26, 26, 30, 46, 20, 42, 34, 32, 34, 52, 26, 46, 33, 50, 42, 58, 26, 60, 30, 46, 32, 50, 48, 66, 58, 50, 44, 70, 40, 72, 66, 46, 58
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Note that n is prime iff a(n)=n-1. - T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
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LINKS
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T. D. Noe, Table of n, a(n) for n = 0..1000
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FORMULA
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a(n)=n+1-A007012(n) - T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
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MATHEMATICA
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Table[cnt=0; Do[If[Mod[Binomial[n, k], n]==0, cnt++ ], {k, 0, n}]; cnt, {n, 0, 100}] - T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
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CROSSREFS
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Sequence in context: A139318 A054541 A102722 this_sequence A131183 A133770 A163373
Adjacent sequences: A020472 A020473 A020474 this_sequence A020476 A020477 A020478
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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EXTENSIONS
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More terms from T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
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