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arXiv · 2606.07885

Weighted Recursions for the Smallest Parts Function

Matthew Ortiz
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Abstract

We establish new polynomial-weighted recursions for Andrews' smallest parts function. Our results use the generating series for the spt function, a harmonic Maass form of weight 3/2, paired with the Dedekind eta function via the Rankin-Cohen bracket. In weights larger than 2, we find a nontrivial quasimodular component, which we determine for the relevant weights. We apply the holomorphic projection operator and the vanishing of cusp form spaces of small enough weight to obtain our results.

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Matthew Ortiz. 2026-08-20. Weighted Recursions for the Smallest Parts Function. https://arxiv.org/abs/2606.07885

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