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Old 2020-10-18, 03:08   #13
Mar 2019

24·32 Posts

Originally Posted by a1call View Post
If I read the correctly, M117239 has no known factors and F117239 is a (Probable) semiprime. So any complete list will have to be exclusively less than 117239.
A small notational quibble: doesn't F_n typically denote the n-th Fermat number, i.e. 2^{2^n}+1?
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