(Soft Question) Largest known semiprimes with no known factors Is there a list, similar to prime numbers and probable primes, of the largest semiprimes with unknown factors? Is there a list of numbers that are either semiprime or prime, with no known factors? Is there literature on how to find large semi primes?
It doesn't exist. Any area of rectangle which sides are prime is a semiprime.
It doesn't exist. Any area of rectangle which sides are prime is a semiprime.