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Search: id:A125241
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| A125241 |
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Numbers n such that binomial(4n, n) + 1 is prime. |
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+0
6
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| 1, 2, 6, 10, 11, 19, 28, 80, 123, 141, 147, 154, 198, 200, 346, 851, 887, 1038, 1329, 2045, 3228, 3274, 3588, 6794, 8045
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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Do[f=Binomial[4n, n]+1; If[PrimeQ[f], Print[n]], {n, 1, 1000}]
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CROSSREFS
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Cf. A125240 = numbers n such that binomial(4n, n) - 1 is prime. Cf. A066699 = numbers n such that binomial(2n, n) + 1 is prime. Cf. A066726 = numbers n such that binomial(2n, n) - 1 is prime. Cf. A125220, A125221, A125242, A125243, A125244, A125245.
Sequence in context: A054645 A050425 A030405 this_sequence A116043 A085258 A133520
Adjacent sequences: A125238 A125239 A125240 this_sequence A125242 A125243 A125244
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KEYWORD
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hard,more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Nov 25 2006
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EXTENSIONS
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More terms from Ryan Propper (rpropper(AT)stanford.edu), Mar 28 2007
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