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Mathematics of Computation
Mathematics of Computation
ISSN 1088-6842(online) ISSN 0025-5718(print)

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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Additional Information

DOI: http://dx.doi.org/10.1090/S0025-5718-1988-0917833-8
PII: S 0025-5718(1988)0917833-8
Article copyright: © Copyright 1988 American Mathematical Society