Lang and Trotter's conjecture on supersingular primes that the number of supersingular primes less than a constant X is within a constant…
Lang and Trotter's conjecture on supersingular primes that the number of supersingular primes less than a constant X is within a constant multiple of \sqrt{X}/\ln{X}
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Source: List of unsolved problems in mathematics (CC BY-SA 4.0)