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A190357
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Decimal expansion of 1/4 - 2/Pi^2.
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1
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0, 4, 7, 3, 5, 7, 6, 3, 2, 7, 1, 5, 3, 2, 4, 4, 5, 7, 1, 1, 2, 2, 4, 1, 0, 7, 3, 5, 8, 0, 5, 4, 4, 7, 2, 2, 1, 9, 1, 2, 8, 2, 4, 5, 0, 6, 5, 5, 5, 0, 6, 9, 0, 2, 3, 0, 8, 7, 8, 1, 9, 3, 6, 2, 1, 1, 6, 5, 3, 7, 5, 8, 0, 7, 5, 5, 2, 9, 1, 1, 7, 6, 1, 7, 5, 8, 1, 4, 5, 2, 1, 4, 8, 7, 5, 6, 3, 2, 4, 7, 7
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OFFSET
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0,2
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COMMENTS
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Constant given on p. 1 of Schlage-Puchta.
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LINKS
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G. C. Greubel, Table of n, a(n) for n = 0..10000
Jan-Christoph Schlage-Puchta, Sumsets avoiding squarefree integers, arXiv:1105.1305 [math.NT], May 6, 2011.
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FORMULA
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Equals (1/4) - (2/Pi^2).
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EXAMPLE
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0.047357632715324457112241...
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MATHEMATICA
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Join[{0}, RealDigits[(1/4) - (2/Pi^2), 10, 100][[1]]] (* G. C. Greubel, Apr 05 2018 *)
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PROG
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(PARI) (1/4) - (2/Pi^2) \\ G. C. Greubel, Apr 05 2018
(MAGMA) R:=RealField(100); [(1/4) - (2/Pi(R)^2)]; // G. C. Greubel, Apr 05 2018
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CROSSREFS
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Cf. A005117, A010716 (1/18), A059956 (6/Pi^2).
Sequence in context: A241026 A198743 A271798 * A296499 A199446 A100127
Adjacent sequences: A190354 A190355 A190356 * A190358 A190359 A190360
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KEYWORD
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nonn,easy,cons
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AUTHOR
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Jonathan Vos Post, May 09 2011
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STATUS
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approved
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