26 Numerics library [numerics]

26.8 Mathematical functions for floating-point types [c.math]

26.8.6 Mathematical special functions [sf.cmath]

26.8.6.19 Riemann zeta function [sf.cmath.riemann.zeta]

double riemann_zeta(double x); float riemann_zetaf(float x); long double riemann_zetal(long double x);
Effects: These functions compute the Riemann zeta function of their respective arguments x.
Returns:
where x is x.