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Abstract Given an odd prime and finite set of odd primes S+, we prove the existence of an imaginary quadratic field whose class number is indivisible by and which splits at every prime in S+. Notably, we do not require that p -1 \, \; (mod\, ) for any of the split primes p that we impose. Our theorem is in the spirit of a result by Wiles, but we introduce a new method. It relies on a significant improvement of our earlier work on the classification of non-holomorphic Ramanujan-type congruences for Hurwitz class numbers.
Beckwith et al. (Wed,) studied this question.