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A125241
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Numbers k such that binomial(4k, k) + 1 is prime.
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5
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0, 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, 11911, 12184, 12327, 12515, 20089, 38173, 41026, 48914
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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Do[f=Binomial[4n, n]+1; If[PrimeQ[f], Print[n]], {n, 1, 1000}]
Select[Range[8100], PrimeQ[Binomial[4#, #]+1]&] (* Harvey P. Dale, Aug 24 2014 *)
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CROSSREFS
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KEYWORD
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hard,more,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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