A122153 - OEIS

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A122153

Decimal expansion of Parity Prime Constant: Sum_{k>=1} (-1)^(k+1) * 1/(2^prime(k)).

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

0,2

COMMENTS

Binary expansion is given in A071986(n) = pi(n) mod 2.

LINKS

Table of n, a(n) for n=0..98.

FORMULA

Equals Sum_{k>=1} (-1)^(k+1) * 1/(2^prime(k)).

Equals lim_{n->infinity} A122150(n)/A034765(n).

EXAMPLE

0.148809550788776224969568467866796531982224132808217067371770000563313912...