Ri(x) Riemann Prime Counting Function

Ri(x) approximates the prime counting function Pi(x). It is computed using the Gram series

Ri(x) = G(x) = 1 + Sum{n = 1, ...} ( Ln(x)^n / (n*n!*Zeta(n+1)) ).

See: Riemann Prime Counting Function -- From MathWorld
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