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Search: id:A128893
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| A128893 |
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(1/p)*(binomial(2*p,p)+2*(p-1)), where p = n-th prime. |
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| 4, 8, 52, 492, 64132, 800048, 137270956, 1860277044, 357975249028, 1036802293087624, 15013817846943908, 47192717955016924592, 10360599532897359064120, 154361699651715243559788, 34589385964790856394651396, 118349529407778329236413352408, 412825418773807104132857739017404
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OFFSET
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1,1
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COMMENT
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For p odd, this is the number of p-element subsets of {1, 2, ..., 2p} whose sum is divisible by p.
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REFERENCES
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R. Honsberger, Mathematical Chestnuts from Around the World, MAA, 2001; see p. 220-223.
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KEYWORD
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nonn,new
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AUTHOR
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njas, Jul 23 2008
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