Generalized Cullen primes of the form n•5n+1

Current data

ASCII format : n*5^n+1 Base : 5 Count : 3 Max n : 2,000,000 Date : 2024-10-25

1242, 18390, 5778486

History

• 2024-10-25: Checked n = 1 - 100000, Gary Barnes, double-check, released
• 2024-08-15: Found n = 5778486, Ryan Propper
• 2023-07-14: Checked n = 500000 - 2000000, Ryan Propper, released
• 2023-07-04: Reserved by Ryan Propper for n = 500000 - 2000000
• 2023-05-28: Checked n = 100000 - 500000, Mark Rodenkirch, double-check n = 100000 - 380283, released
• 2023-04-28: Reserved by Mark Rodenkirch to n = 500000
• 2023-04-23: Checked n = 2 - 100000, Mark Rodenkirch, double-check
• 2012: Checked n = 29357 - 380283, Günter Löh
• 2000: Checked n = 6189 - 29357, Wilfrid Keller
• 1998-11-15: Found n = 18390, Wilfrid Keller
• 1989: Checked n = 1 - 6189, Harvey Dubner
• 1989: Found n = 1242, Harvey Dubner