FOR about seventy-five years the largest known prime number has been P = 2127 − 1, identified as such by Edouard Lucas. It has remained the largest known in spite of many attempts to identify larger ones, although there have been conjectures and claims insufficiently substantiated or entirely unproved.
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IEEE Annals of the History of Computing (1992)
IEEE Annals of the History of Computing (1986)
Computers & Mathematics with Applications (1982)