Abstract
In his 1984 AMS Memoir, Andrews introduced the family of functions \(c\phi _k(n),\) which denotes the number of generalized Frobenius partitions of \(n\) into \(k\) colors. Recently, Baruah and Sarmah, Lin, Sellers, and Xia established several Ramanujan-like congruences for \(c\phi _4(n)\) relative to different moduli. In this paper, employing classical results in \(q\)-series, the well-known theta functions of Ramanujan, and elementary generating function manipulations, we prove a characterization of \(c\phi _4(10n+1)\) modulo 5 which leads to an infinite set of Ramanujan-like congruences modulo 5 satisfied by \(c\phi _4.\) This work greatly extends the recent work of Xia on \(c\phi _4\) modulo 5.
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Hirschhorn, M.D., Sellers, J.A. Infinitely many congruences modulo 5 for 4-colored Frobenius partitions. Ramanujan J 40, 193–200 (2016). https://doi.org/10.1007/s11139-014-9652-x
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DOI: https://doi.org/10.1007/s11139-014-9652-x