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A019510
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a(n) = gcd( binomial(n+3, n) + binomial(n+4, n+1), binomial(n+5, n+2) ).
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1
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2, 5, 1, 7, 20, 3, 5, 11, 2, 65, 7, 5, 8, 17, 15, 19, 10, 7, 11, 115, 4, 25, 13, 9, 70, 29, 5, 31, 16, 55, 17, 35, 6, 37, 95, 13, 20, 41, 7, 215, 22, 15, 23, 47, 40, 49, 25, 17, 26, 265
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Table[GCD[Binomial[n+3, n]+Binomial[n+4, n+1], Binomial[n+5, n+2]], {n, 70}] (* Harvey P. Dale, Nov 16 2014 *)
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PROG
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(PARI) {a(n) = gcd(binomial(n+3, n)+binomial(n+4, n+1), binomial(n+5, n+2))}; \\ G. C. Greubel, Mar 24 2019
(Magma) [GCD(Binomial(n+3, n)+Binomial(n+4, n+1), Binomial(n+5, n+2)): n in [1..60]]; // G. C. Greubel, Mar 24 2019
(Sage) [gcd(binomial(n+3, n)+binomial(n+4, n+1), binomial(n+5, n+2)) for n in (1..60)] # G. C. Greubel, Mar 24 2019
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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David Penney (david(AT)alpha.math.uga.edu)
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STATUS
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approved
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