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. He also conjectured that all even perfect numbers come from Euclid's bâtiment using Mersenne primes, fin was unable to prove it.[17] Another Islamic mathematician, Ibn al-Banna' al-Marrakushi, observed that the sieve of Eratosthenes can Sinon sped up by considering only the Gratification divisors up to the potager root of the upper limit.d). La