PrimeGrid Sierpiński base 5

Purpose

Finding primes for the Sierpiński number base 5 problem.

Multi-Reservation

• Here: The current n_max = 4,913,881 as of 2024-10-01.

Current status

• Status

k-values left

There are 28 sequences:

• 6436
• 7528
• 10918
• 26798
• 31712
• 36412
• 41738
• 44348
• 44738
• 45748
• 58642
• 60394
• 62698
• 64258
• 67612
• 67748
• 71492
• 74632
• 76724
• 83936
• 84284
• 90056
• 92906
• 93484
• 105464
• 126134
• 139196
• 152588

History of eliminated candidates

As of June 2024:

• 2024-06-06: 51208•5^4857576+1
• 2020-05-01: 118568•5^3112069+1
• 2019-04-26: 138514•5^2771922+1
• 2018-06-20: 81556•5^2539960+1
• 2016-03-15: 92158•5^2145024+1
• 2016-03-06: 77072•5^2139921+1
• 2015-11-10: 154222•5^2091432+1
• 2015-05-23: 144052•5^2018290+1
• 2014-10-18: 109208•5^1816285+1
• 2014-08-17: 133778•5^1785689+1
• 2014-07-23: 24032•5^1768249+1
• 2014-01-17: 59912•5^1500861+1
• 2013-12-29: 37292•5^1487989+1
• 2013-06-25: 92182•5^1135262+1
• 2013-06-17: 55154•5^1063213+1
• 2013-03-25: 110488•5⁹¹⁷¹⁰⁰+1
• 2010-08-15: 37328•5⁵⁰⁴⁶⁷⁵+1
• 2010-08-10: 8644•5⁴⁹³⁶¹⁸+1
• 2010-08-08: 51176•5⁴⁸⁴⁶⁶⁹+1
• 2010-08-03: 117434•5⁴⁷²⁶³⁵+1
• 2010-07-31: 96994•5⁴⁶¹⁷⁴⁸+1
• 2010-07-28: 37714•5⁴⁴⁸⁶³⁶+1
• 2010-07-21: 60722•5⁴¹²²⁵⁹+1

Up to date list of eliminations here

See also

• PrimeGrid Riesel base 5
• Sierpiński-Riesel Base 5
• PrimeGrid

External links

• Forum

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