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A336908
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Decimal expansion of Sum_{p prime} (p^2 + p - 1)/(p^2 *(p - 1)^2).
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0
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1, 6, 9, 5, 9, 7, 4, 2, 4, 3, 7, 5, 7, 3, 6, 4, 9, 1, 7, 2, 7, 5, 0, 7, 7, 2, 2, 5, 5, 4, 6, 1, 3, 4, 1, 6, 0, 6, 2, 5, 1, 0, 9, 9, 5, 3, 0, 1, 8, 6, 1, 1, 0, 8, 5, 2, 8, 3, 7, 7, 6, 4, 7, 2, 8, 9, 6, 7, 7, 9, 7, 1, 4, 2, 6, 6, 8, 7, 7, 7, 7, 8, 8, 1, 4, 7, 4
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OFFSET
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1,2
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COMMENTS
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The asymptotic variance of Omega(k) - omega(k) (A046660).
The asymptotic mean of Omega(k) - omega(k) is Sum_{p prime} 1/(p*(p-1)) = 0.773156... (A136141).
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LINKS
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FORMULA
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Equals lim_{m->oo} (1/m) * Sum_{k=1..m} d(k)^2 - ((1/m) * Sum_{k=1..m} d(k))^2, where d(k) = Omega(k) - omega(k) = A001222(k) - A001221(k) = A046660(k).
Equals P(2) + Sum_{k>=3} k*P(k), where P is the prime zeta function.
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EXAMPLE
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1.695974243757364917275077225546134160625109953018611...
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MATHEMATICA
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m = 100; RealDigits[PrimeZetaP[2] + NSum[n * PrimeZetaP[n], {n, 3, Infinity}, WorkingPrecision -> 2*m, NSumTerms -> 3*m], 10, m][[1]]
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PROG
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(PARI) sumeulerrat((p^2 + p - 1)/(p^2 *(p - 1)^2)) \\ Hugo Pfoertner, Aug 08 2020
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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