  We 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.
