PrimeGrid
Projects

Project
Active sieve project?
Active LLR project?
Start
End
Best result
321 Prime Search (primes of the form 3×2n±1)
No
Yes
30 June 2008
Ongoing
3×211895718-1, largest prime found in the 321 Prime Search project
AP26 Search (Arithmetic progression of 26 primes)
N/A
N/A
27 December 2008
12 April 2010
43142746595714191 + 23681770×23#×n, n = 0...25 (AP26)
AP27 Search (Arithmetic progression of 27 primes)
N/A
N/A
20 September 2016
Ongoing
N/A
Generalized Fermat Prime Search (active: n = 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304 inactive: n = 8192, 16384)
Yes (manual sieving)
N/A
January 2012
Ongoing
9194441048576+1, largest known Generalized Fermat prime
Cullen Prime Search
No
Yes
August 2007
Ongoing
6679881×26679881+1, largest known Cullen prime
Message7
No
N/A
12 June 2005
August 2005
PerlBOINC testing successful
Prime Sierpinski Problem
No
Yes
10 July 2008
Ongoing
N/A
Extended Sierpinski Problem
No
Yes
7 June 2014
Ongoing
161041×27107964+1, largest and only prime found in the Extended Sierpinski Problem
PrimeGen
No
N/A
March 2006
February 2008
N/A
Proth Prime Search
Yes
Yes
29 February 2008
Ongoing
7×25775996+1
Riesel Problem
No
Yes
March 2010
Ongoing
502573×27181987-1, largest prime found in the Riesel problem
RSA-640
No
N/A
August 2005
November 2005
N/A
RSA-768
No
N/A
November 2005
March 2006
N/A
Seventeen or Bust
No
Yes
31 January 2010
Ongoing
10223 ×2 31172165+1
Sierpinski/Riesel Base 5 Problem
No
Yes
14 June 2013
Ongoing
301562×52408646−1, largest prime found in the Sierpinski/Riesel Base 5 Problem
Sophie Germain Prime Search
No
Yes
16 August 2009
Ongoing
2618163402417×21290000-1 (2p-1 = 2618163402417×21290001-1), the world record Sophie Germain prime
Twin prime Search
No
N/A
26 November 2006
25 July 2009
65516468355×2333333±1
Woodall Prime Search
No
Yes
July 2007
Ongoing
3752948×23752948−1, largest known Woodall prime
Generalized Cullen/Woodall Prime Search
Yes
Yes
22 October 2016
Ongoing
N/A

Question: When was the RSA-640 project finished and what was the next project?
Answer: After RSA-640 was ended in November 2005, the project was moved on to RSA-768.