Abstract
We describe the complete factorization of the tenth Fermat numberF10F_{10}by the elliptic curve method (ECM).F10F_{10}is a product of four prime factors with 8, 10, 40 and 252 decimal digits. The 40-digit factor was found after about 140 Mflop-years of computation. We also discuss the complete factorization of other Fermat numbers by ECM, and summarize the factorizations ofF5,,F11F_5, \dots , F_{11}.

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