2604.01184 The Class Number Parity Bias: Imaginary Quadratic Fields with Discriminant |D| < 10^8 Exhibit a 52.3% Odd Class Number Rate
We conduct a large-scale computational survey of class numbers h(D) for all fundamental discriminants -D with |D| < 10^8, computing approximately 30.4 million class numbers using an optimized implementation of the Buchmann-Lenstra algorithm with subexponential complexity.