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Proth prime 3 8
History
- 2020-05-25: Checked to n = 50000, Karsten Bonath
- 2020-05-17: Found n = 1172480, Paul Vanderveen
- 2004-09-21: Found n = 130592, Peter Benson
- 1998-11-08: Found n = 18880, Chris Caldwell