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A066975
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a(n) = gcd(binomial(2n,n), 2^n + 1).
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1
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1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 3, 17, 1, 5, 9, 1, 3, 5, 3, 1, 3, 5, 3, 1, 3, 1, 1, 17, 3, 41, 1, 1, 3, 5, 129, 1, 1, 5, 1, 1, 3, 5, 3, 17, 9, 5, 3, 1, 3, 1, 9, 1, 3, 5, 3, 1, 3, 5, 3, 17, 3, 1, 3, 1, 33, 5, 3, 1, 9, 115825, 3, 97, 3, 5, 99, 1, 129, 5, 3, 1, 1, 5, 3, 17, 11, 5, 3, 1, 3, 35425, 1, 1
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OFFSET
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1,5
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LINKS
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MATHEMATICA
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Table[GCD[Binomial[2n, n], 2^n+1], {n, 100}] (* Harvey P. Dale, Aug 26 2012 *)
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PROG
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(PARI) { for (n=1, 1000, write("b066975.txt", n, " ", gcd(binomial(2*n, n), 2^n + 1)) ) } \\ Harry J. Smith, Apr 12 2010
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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