Thread: Peter Cameron question View Single Post
2020-10-18, 03:08   #13
mathwiz

Mar 2019

24·32 Posts

Quote:
 Originally Posted by a1call If I read the merssene.org 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. $2^{2^n}+1$?