Proth primes of the form 17•2n+1

Current data

k , b : 17 , 2 Type : Low Count : 20 Nash : 672 Max n : 9,000,000 Date : 2021-04-01

3, 15, 27, 51, 147, 243, 267, 347, 471, 747, 2163, 3087, 5355, 6539, 7311, 99231, 824451, 1388355, 1990299, 8636199

History

• 2021-04-01: Checked to n = 9000000, PrimeGrid Fermat Divisor Search
• 2021-02-17: Found n = 8636199, Tom Greer, PrimeGrid Fermat Divisor Search (Official Announcement)
• 1979: Checked n = 1500 - 8000, Gordon V. Cormack, Hugh C. Williams
• 1979: Found n = 7311, Gordon V. Cormack, Hugh C. Williams
• 1979: Found n = 6539, Gordon V. Cormack, Hugh C. Williams
• 1979: Found n = 5355, Gordon V. Cormack, Hugh C. Williams
• 1979: Found n = 3087, Gordon V. Cormack, Hugh C. Williams
• 1979: Found n = 2163, Gordon V. Cormack, Hugh C. Williams