Wang, LQLQWangYI-FAN YANG2022-12-192022-12-192022-111382-4090https://scholars.lib.ntu.edu.tw/handle/123456789/626607We develop an approach to establish 1 / π-series from bimodular forms. Utilizing this approach, we obtain new families of 2-variable 1 / π-series associated to Zagier’s sporadic Apéry-like sequences. We first establish a general form of 1 / π-series involving constants related to the evaluation of modular forms at CM-points. Then we discuss situations when the series have rational terms. In addition, we discuss strategies for evaluating the constants involved and present a number of explicit 1 / π-series.Ramanujan 1/pi-series; Bimodular forms; Apery-like sequence; Hypergeometric series; CM-points; LEGENDRE POLYNOMIALS; MODULAR-FORMS; SERIES; EQUATIONS; IDENTITIES; FORMULAS; ANALOGS; NUMBERS; 1/PIjournal article10.1007/s11139-021-00532-62-s2.0-85122516098WOS:000740125000001https://api.elsevier.com/content/abstract/scopus_id/85122516098