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Search: id:A129488
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| A129488 |
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Smallest odd prime dividing binomial(2n,n). |
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+0
3
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| 3, 5, 5, 3, 3, 3, 3, 5, 11, 3, 7, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 7, 5, 3, 7, 7, 3, 3, 3, 3, 7, 7, 3, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 5, 3, 5, 5, 3, 3, 3, 3, 5, 5, 3, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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The Erdos paper calls this function g(n) and states that it not known whether it is bounded. Currently, g(3160)=13 is the greatest known value of g. See A129489.
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REFERENCES
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P. Erdos, R. L. Graham, I. Z. Russa and E. G. Straus, On the prime factors of C(2n,n), Math. Comp. 29 (1975), 83-92.
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LINKS
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T. D. Noe, Table of n, a(n) for n=2..5000
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MATHEMATICA
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Table[Transpose[FactorInteger[Binomial[2n, n]]][[1, 2]], {n, 2, 150}]
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CROSSREFS
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Cf. A030979 (n such that g(n)=11).
Sequence in context: A019944 A110551 A141334 this_sequence A053670 A085963 A153098
Adjacent sequences: A129485 A129486 A129487 this_sequence A129489 A129490 A129491
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KEYWORD
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easy,nonn
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AUTHOR
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T. D. Noe (noe(AT)sspectra.com), Apr 17 2007
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