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A067279
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Factorial expansion of zeta(2) : zeta(2) = Sum_{n>=1} a(n)/n!.
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3
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1, 1, 0, 3, 2, 2, 2, 3, 6, 6, 8, 1, 11, 12, 7, 6, 13, 7, 3, 2, 2, 2, 9, 20, 9, 16, 11, 0, 12, 13, 19, 25, 26, 31, 18, 24, 21, 32, 12, 34, 22, 24, 13, 14, 41, 20, 34, 29, 22, 40, 50, 4, 33, 50, 39, 8, 15, 24, 14, 59, 40, 3, 9, 29, 27, 14, 18, 39, 59, 44, 28, 30, 35, 5, 64, 20, 18
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OFFSET
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1,4
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LINKS
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FORMULA
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a(n) = floor(n!*zeta(2)) - n*floor((n-1)!*zeta(2)), for n>=2.
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MATHEMATICA
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With[{b = Zeta[2]}, Table[If[n == 1, Floor[b], Floor[n!*b] - n*Floor[(n - 1)!*b]], {n, 1, 100}]] (* G. C. Greubel, Nov 26 2018 *)
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PROG
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(PARI) default(realprecision, 250); b = zeta(2); for(n=1, 80, print1(if(n==1, floor(b), floor(n!*b) - n*floor((n-1)!*b)), ", ")) \\ G. C. Greubel, Nov 26 2018
(Magma) SetDefaultRealField(RealField(250)); L:=RiemannZeta(); [Floor(Evaluate(L, 2))] cat [Floor(Factorial(n)*Evaluate(L, 2)) - n*Floor(Factorial((n-1))*Evaluate(L, 2)) : n in [2..80]]; // G. C. Greubel, Nov 26 2018
(Sage)
if (n==1): return floor(zeta(2))
else: return expand(floor(factorial(n)*zeta(2)) - n*floor(factorial(n-1)*zeta(2)))
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CROSSREFS
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KEYWORD
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easy,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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