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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
| 1,1
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COMMENTS
| No other terms below 10^9.
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LINKS
| Max Alekseyev, PARI/GP scripts for various problems
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EXAMPLE
| 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
| Do[If[ !PrimeQ[n], If[Mod[Binomial[7*n, n], n] == Mod[7^n, n], Print[n]]], {n, 2, 20000}]
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CROSSREFS
| Cf. A080469.
Sequence in context: A072422 A003300 A084379 * A093018 A167336 A003634
Adjacent sequences: A109766 A109767 A109768 * A109770 A109771 A109772
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KEYWORD
| more,nonn
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AUTHOR
| Ryan Propper (rpropper(AT)stanford.edu), Aug 13 2005
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EXTENSIONS
| 226037 from Max Alekseyev (maxale(AT)gmail.com), Sep 13 2009
Two more terms from Max Alekseyev (maxale(AT)gmail.com), Nov 06 2009
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