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Search: id:A109769
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| A109769 |
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Composite n such that binomial(7*n, n) == 7^n (mod n). |
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1
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OFFSET
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1,2
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COMMENT
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No other terms below 10^6.
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EXAMPLE
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18 is a term because binomial(7*18, 18) = 2797093093529137508875, 7^18 = 1628413597910449 and 2797093093529137508875 mod 18 = 1628413597910449 mod 18 = 1.
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MATHEMATICA
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Do[If[ !PrimeQ[n], If[Mod[Binomial[7*n, n], n] == Mod[7^n, n], Print[n]]], {n, 1, 20000}]
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CROSSREFS
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Cf. A080469.
Adjacent sequences: A109766 A109767 A109768 this_sequence A109770 A109771 A109772
Sequence in context: A072422 A003300 A084379 this_sequence A093018 A003634 A080910
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KEYWORD
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more,nonn
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AUTHOR
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Ryan Propper (rpropper(AT)stanford.edu), Aug 13 2005
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EXTENSIONS
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226037 from Max Alekseyev (maxale(AT)gmail.com), Sep 13 2009
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