PrimeGrid The Riesel Problem

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Purpose

Finding primes for the Riesel problem 1.

Current status

• Status at PrimeGrid
• Multi Reservation 11: The current n_max = 16,034,000 as of 2024-11-12.

k-values left

There are 41 sequences:

• 23669
• 31859
• 38473
• 46663
• 67117
• 74699
• 81041
• 121889
• 129007
• 143047
• 161669
• 206231
• 215443
• 226153
• 234343
• 245561
• 250027
• 315929
• 319511
• 324011
• 325123
• 327671
• 336839
• 342847
• 344759
• 362609
• 363343
• 364903
• 365159
• 368411
• 371893
• 384539
• 386801
• 397027
• 409753
• 444637
• 470173
• 474491
• 477583
• 485557
• 494743

History

After many individual searches and the Riesel Sieve Project, in March 2010 PrimeGrid took the remaining candidates into the PrimeGrid The Riesel Problem.

Primes found by project

• 2021-02-08: Riesel 9221•2^11392194-1
• 2020-11-17: Riesel 146561•2^11280802-1
• 2017-12-13: Riesel 273809•2^8932416-1
• 2014-10-04: Riesel 502573•2^7181987-1
• 2014-10-02: Riesel 402539•2^7173024-1
• 2013-12-25: Riesel 40597•2^6808509-1
• 2013-10-10: Riesel 304207•2^6643565-1
• 2013-10-05: Riesel 398023•2^6418059-1
• 2012-06-23: Riesel 252191•2^5497878-1
• 2012-02-02: Riesel 162941•2⁹⁹³⁷¹⁸-1
• 2011-05-31: Riesel 353159•2^4331116-1
• 2011-05-26: Riesel 141941•2^4299438-1
• 2011-05-08: Riesel 415267•2^3771929-1
• 2011-05-28: Riesel 123547•2^3804809-1
• 2011-04-05: Riesel 65531•2^3629342-1
• 2011-01-14: Riesel 428639•2^3506452-1
• 2010-11-21: Riesel 191249•2^3417696-1

External links

• History by Wilfrid Keller
• About the Riesel Problem - PrimeGrid forums

PrimeGrid

Miscellaneous

Main

Subprojects

Type Proth : 321 Prime Search 27121 Prime Search Proth Prime Search Proth Prime Search Extended Proth Mega Prime Search Type Sierpiński : Seventeen or Bust Extended Sierpiński Project Prime Sierpiński Problem Sierpiński base 5 Type Riesel : The Riesel Problem Riesel base 5 Type Fermat : Generalized Fermat Prime Search b216+1 b217+1 b218+1 b219+1 b220+1 b221+1 b222+1 Fermat Divisor Search Type Cullen/Woodall : Cullen Prime Search Woodall Prime Search Generalized Cullen Prime Search Type Others : AP27 Search Sophie Germain Search Wieferich and Wall-Sun-Sun Prime Search

Completed

GFN b215+1

Others