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A122153
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Decimal expansion of Parity Prime Constant: Sum_{k>=1} (-1)^(k+1) * 1/(2^prime(k)).
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4
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1, 4, 8, 8, 0, 9, 5, 5, 0, 7, 8, 8, 7, 7, 6, 2, 2, 4, 9, 6, 9, 5, 6, 8, 4, 6, 7, 8, 6, 6, 7, 9, 6, 5, 3, 1, 9, 8, 2, 2, 2, 4, 1, 3, 2, 8, 0, 8, 2, 1, 7, 0, 6, 7, 3, 7, 1, 7, 7, 0, 0, 0, 0, 5, 6, 3, 3, 1, 3, 9, 1, 2, 6, 2, 2, 3, 3, 3, 7, 4, 5, 1, 8, 4, 9, 4, 5, 1, 4, 3, 7, 7, 8, 8, 8, 0, 8, 5, 2
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OFFSET
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0,2
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COMMENTS
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Binary expansion is given in A071986(n) = pi(n) mod 2.
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LINKS
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FORMULA
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Equals Sum_{k>=1} (-1)^(k+1) * 1/(2^prime(k)).
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EXAMPLE
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0.148809550788776224969568467866796531982224132808217067371770000563313912...
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MATHEMATICA
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RealDigits[Sum[(-1)^(k+1)*1/2^Prime[k], {k, 1, 1000}], 10, 100]
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PROG
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(PARI) suminf(k=1, (-1)^(k+1) * 1/2^prime(k)) \\ Michel Marcus, Mar 20 2019
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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