PrimeGrid Cullen Prime Search

Purpose

The goal of this project is to find Cullen primes of the form n•2ⁿ+1.

Status

• Cullen search status at PrimeGrid

History

• 2009-07-25: 6679881•2^6679881+1 (2,010,852 digits)
• 2009-04-20: 6328548•2^6328548+1 (1,905,090 digits)

See also

• PrimeGrid Woodall Prime Search
• PrimeGrid

External links

• Welcome to the Cullen/Woodall Prime Search - 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