Generalized Cullen primes of the form n•15n+1

Current data

ASCII format : n*15^n+1 Base : 15 Count : 10 Max n : 1,500,000 Date : 2024-10-25

8, 14, 44, 154, 274, 694, 17426, 59430, 451554, 551878

Remarks :

The sequence A242198 in OEIS

History

• 2024-10-25: Checked n = 1 - 100000, Gary Barnes, double-check, released
• 2023-04-29: Checked n = 200000 - 1500000, Ryan Propper, released
• 2023-04-28: Found n = 551878, Ryan Propper
• 2023-04-28: Found n = 451554, Ryan Propper
• 2023-04-28: Reserved by Ryan Propper to n = 1500000
• 2023-04-27: Checked n = 100000 - 200000, Mark Rodenkirch, double-check n = 100000 - 136149, released
• 2023-04-17: Checked n = 2 - 100000, Mark Rodenkirch, double-check
• 2023-04-01: Reserved by Mark Rodenkirch to n = 200000
• 2011: Checked n = 10083 - 136149, Günter Löh
• 2001-10-05: Found n = 59430, Günter Löh
• 2000-07-05: Found n = 17426, Günter Löh
• 2000: Checked n = 3124 - 10083, Wilfrid Keller
• 1989: Checked n = 1 - 3124, Harvey Dubner