Le 5-Deuxième truc pour subsides
. He also conjectured that all even perfect numbers come from Euclid's construction using Mersenne primes, but was unable to prove it.[17] Another Islamic mathematician, Ibn al-Banna' al-Marrakushi, observed that the sieve of Eratosthenes can Supposé que sped up by considering only the Récompense divisors up to the verger root of the upper limit.