"Counting in their heads" - 1895 oil painting

[Joe Horn]

(08-15-2020 02:55 AM)Gerson W. Barbosa Wrote:  There is also Hurwitz zeta function.

For example,

ζ(-5, 50) - ζ(-5, 151) = 1934166665000

But what calculator has that built-in?

Anybody know which zeta function Prime's CAS uses when Zeta() is given two arguments? Prime evaluates Zeta(2,2) as 1.9892802343, but Wolfram Alpha returns pi^2/6-1 (approx 0.644934) for HurwitzZeta(2,2). Prime's Help screen for Zeta() does not mention a two-argument syntax, so it's a mystery to me.