2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143802We provide a systematic method to compute arithmetic sums including some previously computed by Alaca, Alaca, Besge, Cheng, Glaisher, Huard, Lahiri, Lemire, Melfi, Ou, Ramanujan, Spearman and Williams. Our method is based on quasimodular forms. This extension of modular forms has been constructed by Kaneko andZagier.26 pagesNumber Theory11A25 11F11 11F25 11F20text