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Mathematics of Computation

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The twentieth Fermat number is composite

Authors: Jeff Young and Duncan A. Buell
Journal: Math. Comp. 50 (1988), 261-263
MSC: Primary 11A51; Secondary 11Y05, 11Y11
MathSciNet review: 917833
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Abstract: The twentieth Fermat number, ${F_{20}} = {2^{{2^{20}}}} + 1$, has been proven composite by machine computation.

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Article copyright: © Copyright 1988 American Mathematical Society