Let script O sign be the ring of integers of a p-adic field and its maximal ideal. This paper computes the Jordan-Hölder decomposition of the reduction modulo p of the cuspidal representations of GL2(script O sign/ e) for e ≥ 1. An alternative formulation of Serre's conjecture for Hilbert modular forms is then provided.
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Acknowledgements. The author is very grateful to the referee for comments that improved the exposition, and particularly for an observation that considerably simplified the computations in Section 2. He is grateful to Ron Livné and the Golda Meir Fellowship Trust for supporting this research.