Proth primes of the form 31•2n+1

Reserved! This sequence is currently part of Multi Reservation 20: Riesel problem 3.

Current data

k , b : 31 , {{{Pb}}} Count : 12 Nash : 839 Max n : 1,000,000 Date : 2023-06-29 Reserved : Alexander JonesAlexander Jones/Reserved

8, 60, 68, 140, 216, 416, 1808, 1944, 9096, 76596, 93168, 8348000

[[Category:Proth {{{Pb}}}|#.....00031]][[Category:Proth {{{Pb}}} Low-weight|#.....00031]]

History

• 2021-01-19: Found n = 8348000, Igor Karpenko, PrimeGrid Fermat Divisor Search
• 2018: Checked to n = 3321996, PrimeGrid
• 1995-08: Found n = 93168, Jeffrey Young
• 1995-08: Found n = 76596, Jeffrey Young
• 1983: Found n = 9096, Wilfrid Keller