2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221163In 1914 S. Ramanujan recorded a list of 17 series for $1/π$. We survey the methods of proofs of Ramanujan's formulae and indicate recently discovered generalizations, some of which are not yet proven.13 pages; v2: two typos corrected, references updated, numeration of formulae changed to agree with the published versionNumber TheoryClassical Analysis and ODEs11F11, 11Y60, 33C20 (Primary); 05A19, 11B65, 11J82, 11M06, 14H52, 14J32, 33C75, 33F10, 34M50, 40G99, 65B10, 65Q05 (Secondary)text