Mariano Ferrari, Pablo A. Panzone
An identity for the finite sum ∑N1 z^n/(qn_(-r) ) is given. Related sums (or series) were studied by Scherk, Clausen, Ramanujan, Shanks, Andrews, and others. We use such identity to give new formulas for∑1∞zn/(qn_(-r) ) , the Riemann zeta function and the Euler–Mascheroni constant. An irrationality result is also proved.
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