Title: An alternative to Riemann-Siegel type formulas
Abstract: Simple unsmoothed formulas to compute the Riemann zeta function, and Dirichlet $L$-functions to a powerfull modulus, are derived by elementary means (Taylor expansions and the geometric series). The formulas enable the square-root of the analytic conductor complexity, up to logarithmic loss, and have an explicit remainder term that is easy to control. The formula for zeta yields a convexity bound of the same strength as that from the Riemann-Siegel formula, up to a constant factor. Practical parameter choices are discussed.