PrimeGrid Fermat Divisor Search

Fermat Divisor Search was a PrimeGrid project searching for large Fermat divisors. It began in September 2019, and ended in April 2021.

Purpose

The project searched for Fermat divisors of the form k•2ⁿ+1, for the following ranges:

• 5 ≤ k ≤ 49 for n ≤ 9,000,000, with two exceptions:
  • k = 9 and 27 did not search even n-values, because they cannot produce Fermat divisors.
• k = 1323, 2187, 3267 for even n ≤ 3,322,000
• k = 3125, 3375 for n ≤ 3,322,000
• k = 19683 for n ≤ 4,000,000

Completed status page

Found primes

• 2021-03-01: 25•2^8788628+1
• 2021-02-17: 17•2^8636199+1
• 2021-01-27: 25•2^8456828+1
• 2021-01-23: 39•2^8413422+1
• 2021-01-19: 31•2^8348000+1
• 2021-01-14: 27•2^7963247+1, divides F(7963245)
• 2021-01-14: 39•2^7946769+1
• 2021-01-14: 29•2^7899985+1
• 2020-12-13: 45•2^7661004+1
• 2020-12-06: 15•2^7619838+1
• 2020-11-12: 45•2^7513661+1
• 2020-10-27: 29•2^7374577+1
• 2020-10-25: 15•2^7300254+1
• 2020-10-24: 19•2^6833086+1
• 2020-10-20: 39•2^6684941+1
• 2020-10-20: 39•2^6648997+1
• 2020-08-15: 39•2^6164630+1
• 2020-06-04: 21•2^6048861+1
• 2020-02-16: 41•2^5651731+1
• 2020-01-28: 31•2^5560820+1
• 2020-01-22: 13•2^5523860+1, divides F(5523858)
• 2019-12-21: 45•2^5308037+1
• 2019-11-23: 39•2^5119458+1
• 2019-10-16: 15•2^4800315+1
• 2019-10-14: 31•2^4673544+1
• 2019-10-14: 39•2^4657951+1
• 2019-10-12: 29•2^4532463+1
• 2019-10-12: 25•2^4481024+1
• 2019-10-10: 23•2^4300741+1
• 2019-10-02: 37•2^4046360+1
• 2019-09-28: 29•2^3964697+1
• 2019-09-28: 39•2^3961129+1
• 2019-09-22: 49•2^3837090+1
• 2019-09-18: 25•2^3733144+1
• 2019-09-17: 45•2^3677787+1
• 2019-09-16: 33•2^3649810+1
• 2019-09-13: 3125•2^3124079+1
• 2019-09-11: 3125•2^2867399+1
• 2019-09-11: 2187•2^2786802+1
• 2019-09-11: 1323•2^2764024+1
• 2019-09-11: 3125•2^2697651+1
• 2019-09-09: 3375•2^2314297+1
• 2019-09-09: 3267•2^2305266+1
• 2019-09-09: 1323•2^2186806+1
• 2019-09-09: 1323•2^2205832+1
• 2019-09-09: 3267•2^2173170+1
• 2019-09-08: 3125•2^1583223+1
• 2019-09-08: 19683•2^2265896+1
• 2019-09-07: 19683•2^2033900+1
• 2019-09-07: 19683•2^1868828+1
• 2019-09-07: 19683•2^1797997+1
• 2019-09-07: 19683•2⁹⁰¹⁷⁴⁵+1
• 2019-09-06: 19683•2⁴⁹³⁸⁴⁶+1
• 2019-09-06: 19683•2⁴⁸⁵⁸⁴⁵+1
• 2019-09-06: 19683•2³⁶⁶⁶⁶⁵+1

See also

• Multi Reservation
• PrimeGrid

External links

• PrimeGrid Forum