For square-free n of the form product of primes ≡5 mod 8 times one prime ≡7 or 3 mod 8, if n is congruent then h(-n) must satisfy explicit divisibility or 2-power congruence conditions with related class numbers.
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$2$-Selmer groups, $2$-class groups, and congruent numbers
For square-free n of the form product of primes ≡5 mod 8 times one prime ≡7 or 3 mod 8, if n is congruent then h(-n) must satisfy explicit divisibility or 2-power congruence conditions with related class numbers.