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A066968
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Denominators of b(n) = (1/16)^n*(4/(8*n+1) - 2/(8*n+4) - 1/(8*n+5) - 1/(8*n+6)).
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3
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15, 6552, 5026560, 15590400, 4561108992, 244729774080, 15293220913152, 6027885936640, 2292288470384640, 143113842220597248, 2278611404728565760, 39351244081172840448, 3515953192213728460800, 2551413037895138672640
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OFFSET
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0,1
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LINKS
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FORMULA
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Sum_{k>=0} b(k) = Pi.
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MATHEMATICA
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Denominator[Table[1/16^n (4/(8n+1)-2/(8n+4)-1/(8n+5)-1/(8n+6)), {n, 0, 20}]] (* Harvey P. Dale, Jul 16 2014 *)
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PROG
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(PARI) a(n)=denominator(1/16^n*(4/(8*n+1)-2/(8*n+4)-1/(8*n+5)-1/(8*n+6)))
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CROSSREFS
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KEYWORD
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easy,frac,nonn
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AUTHOR
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STATUS
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approved
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