10/10/2004 - 616 down, 234 to go.

01/10/2004 - A new record for Joe with exponent 181806.

10/05/2004 - The massive Keller prime 216751*2903792 +1 found as part of the PSP program.

23/02/2004 - 611 down, 239 to go.

20/02/2004 - Another new record exponent from the PSP 263927*2639599 +1.

05/02/2004 - Two from PSP.

02/02/2004 - Two from Dirk.

19/01/2004 - A new record exponent from the PSP 122149*2578806 +1.

23/12/2003 - One from Dan.

12/12/2003 - A second PSP.

05/12/2003 - Harsh Aggarwal becomes the first new contributor in some time. He is the co-ordinator of the "Prime Sierpinski Prime Search" (also known as PSP) which will concentrate on prime values of k up to the next smallest Sierpinski numbers 271129. As an introduction, PSP provides our 600th prime, 87743*2212565 +1, found on 18/11/2003 by Morris Cox.

11/08/2003 - 599 down, 251 to go.

11/08/2003 - Joe's newest Keller prime. Only waited a year!

13/05/2003 - One from Brian.

16/04/2003 - Jim McE takes over from Kimmo as the record holder, with the astonishing prime 446509*2557118 +1.

20/03/2003 - Dan keeps chugging away, testing values over the 400k limit.

24/02/2003 - Another one from Jim McE.

12/01/2003 - First result of the new year is that Kimmo's previous prime for k = 889727 is

not the Keller prime. That distinction goes to n = 391475.

02/12/2002 - Kimmo finds another big one, for k = 889727 and n = 422435, but wait for it!

20/11/2002 - The first new prime since the latest update comes from Kimmo.

17/11/2002 - 593 down, 257 to go.

06/11/2002 - Things seem to be getting busy, with Jim McE providing another large prime.

05/11/2002 - Kimmo smashes his previous best with 281543*2440853 +1

23/10/2002 - Kimmo breaks the record with 686479*2372062 +1

03/08/2002 - Joe's luck seems to be turning - a prime with exponent n = 141906.

24/06/2002 - Joe finally locates a further prime at n = 140148.

03/06/2002 - After some considerable time without tangible results, Dan comes up with 2 primes on the same day.

10/11/2001 - Jim McE provides a new third largest value, which is also the third value with exponent in excess of 300000.

04/11/2001 - 580 down, 270 to go.

20/10/2001 - Sander's first important contribution of a new Keller prime.

10/10/2001 - With Joe, Dan and Sander taking over all of Phil's workload, all but 20 survivors have been pushed beyond the current search base of 100000.

05/10/2001 - We welcome Sander Hoogendoorn to the search.

05/09/2001 - 576 down, 274 to go.

04/09/2001 - A new record for Dan, scraping into the top twenty with n = 185727.

13/08/2001 - A further record for Joe, at n = 113609.

08/08/2001 - Brian moves ahead of Kimmo in the count of primes with exponent greater than 105, with 32, ahead of Kimmo's 31. Kimmo still leads the overall scoring table.

22/06/2001 - A new record for Joe, and the first one over 105, at n = 106719.

19/06/2001 - Kimmo provides a new record with the staggering 173933*2340181 +1.

14/06/2001 - 565 down, 285 to go, search base 100000 (just to prove that we're still working).

09/05/2001 - 556 down, 294 to go, search base 100000.

08/05/2001 - A red letter day - the search base is now 100000.

07/05/2001 - Another n > 200000 prime from Kimmo, a new record at 198113*2267005 +1.

25/04/2001 - A new record for Joe, n = 93184.

26/03/2001 - A new record for Joe, n = 86543.

24/02/2001 - Jim McE provides a fifth Keller prime with exponent greater than 200000, which takes the number of outstanding values below 300.

19/02/2001 - The last value still at the old search limit of 50000 is treated by Kimmo. The new current lower search limit is now 60000.

28/01/2001 - A new record for Joe, exponent 75885.

15/01/2001 - Brian provides a fourth Keller prime with exponent greater than 200000. The search base is now 50000.

12/01/2001 - Kimmo provides his second Keller prime with exponent greater than 200000.

03/01/2001 - 541 down, 309 to go, search base 40000.

02/01/2001 - A new record exponent for Joe, but it's only 67590. Brian provides a new third largest Keller prime, breaking the Kimmo/Jim F monopoly on the top ten.

31/12/2000 - The first couple of new Keller primes received for a while.

20/12/2000 - The search base is now 40000. Apart from this, it's very quiet at the moment.

12/12/2000 - The search base has now been officially raised to 30000.

10/12/2000 - At last Joe finds a Keller prime with exponent greater than 50000 (I can now appear on the big primes list).

08/12/2000 - 520 down, 330 to go, search base 20000.

01/12/2000 - 512 down, 338 to go, search base 20000.

28/11/2000 - Kimmo find the massive Keller prime 546529*2264498 +1.

25/11/2000 - We pass the 500 mark for Keller primes found.

24/11/2000 - Jim F finds our first Keller prime with exponent in excess of 200000. The actual value is 910733*2200233 +1.

23/11/2000 - 498 down, 352 to go, search base 20000.

22/11/2000 - Two primes with exponent over 100000 from Brian. Daval has to leave the project.

21/11/2000 - Several large Keller primes supplied by Jim F, Dan and Phil.

18/11/2000 - 488 down, 362 to go, search base 20000.

17/11/2000 - On the same day, Jim F finds a Keller prime with exponent 183079 and Kimmo finds one with exponent 188027. These are amongst the largest non-Mersenne primes in existence.

09/11/2000 - 477 down, 373 to go, search base 20000.

07/11/2000 - Is there no end to these large primes ? Kimmo provides our tenth Keller prime with exponent in excess of 100000.

06/11/2000 - Kimmo does it again, with a new record exponent of 178863.

03/11/2000 - 465 down, 385 to go, search base 20000.

03/11/2000 - Kimmo takes back the record with an exponent of 164613, and leaps from 4th to 1st in the new rankings.

01/11/2000 - Joe adds Nash weight and score value columns to the status report. Jim F provides a new record exponent of 142989, so it is no surprise that he tops the rankings.

28/10/2000 - The number of outstanding values drops below 400.

27/10/2000 - 449 down, 401 to go, search base 20000 (but not for much longer).

27/10/2000 - Joe demerges the top ten table from the history section to create a new webpage of large Keller primes (exponent > 50000) found during the search.

23/10/2000 - Nestor provides a Keller prime with 6-digit exponent.

20/10/2000 - The search base for the first half of the table is now 30000.

19/10/2000 - 425 down, 425 to go, search base 20000.

19/10/2000 - Lots of updates have come in over the last couple of days, including, from Jim F, a fifth Keller prime with exponent greater than 105. We have now reached halfway in terms of number of Keller primes found, as can be seen from the above statistics.

18/10/2000 - The largest Keller prime Joe has ever found - exponent 44673.

13/10/2000 - Nestor finally makes contact. He has pushed the search limit on k = 957977 to 522000, surely a record. Two primes from Brian send us passed the 400 mark for Keller primes found.

09/10/2000 - 393 down, 457 to go, search base 20000.

04/10/2000 - 381 down, 469 to go, search base 20000.

04/10/2000 - Phil completes the last few values that were at 18000, bringing the search base to 20000.

02/10/2000 - From today, the search base value quoted will be the effective search base rather than the background value used as a double-check. This coincides with Dan completing the last few values that were at 16000, and so the effective search base is now 18000.

30/09/2000 - A top ten prime from Jim F.

29/09/2000 - Brian provides a top three prime.

27/09/2000 - 362 down, 488 to go, search base 11610.

26/09/2000 - Joe completes the 500k, 800k and 900k ranges to n = 20000. The number of outstanding values drops below 500.

24/09/2000 - A top ten prime from Dan.

22/09/2000 - Ray takes a large range of values from 876529 to 903211.

21/09/2000 - 328 down, 522 to go, search base 11500.

20/09/2000 - Joe raises limits on 800k and 900k ranges to 16000 and on 500k range to 18000. The real search base is now 16000.

18/09/2000 - 303 down, 547 to go, search base 11390.

18/09/2000 - We pass the 300 mark for Keller primes found. Ray Ballinger asks for some more values, making him an official member of the search team.

15/09/2000 - Jim F's confirmation run agrees completely with Joe's early work.

14/09/2000 - Kimmo finds biggest Keller prime yet with exponent 134472.

13/09/2000 - 294 down, 556 to go, search base 11370.

12/09/2000 - Jim F begins confirmation of early results.

09/09/2000 - Joe completes the 700k range to n = 20000. The real search base is now 13000. The background search base now becomes purely a double-checking safety net process.

08/09/2000 - 263 down, 587 to go, search base 11330.

05/09/2000 - 256 down, 594 to go, search base 11290.

04/09/2000 - The number of outstanding k values drops below 600.

01/09/2000 - Joe adds the Top Ten Keller Primes table to the history section. Joe also starts the 500k range using Jim F's method.

30/08/2000 - 237 down, 613 to go, search base 11190.

29/08/2000 - Joe starts 800k and 900k ranges using Jim F's method (use proth.exe to as a quick sieve and then prp.exe to reject non-primes and then back to proth.exe for final primality check). Kimmo provides new second largest exponent with n = 101723.

28/08/2000 - Dirk rejoins the search.

27/08/2000 - Jim F lifts the search base for values between 600k and 700k to n = 20000.

26/08/2000 - Dan Morenus finds the third largest prime to date, with exponent 98714.

25/08/2000 - 191 down, 659 to go, search base 11060.

25/08/2000 - Ray Ballinger sneaks in a couple of Keller primes, including the new second biggest exponent 98942.

24/08/2000 - Jim Fougeron sends his second set of primes. Unfortunately, Joe didn't even know about the first set and has to rectify the situation. Jim F gets the range 360000-400000 to play with.

23/08/2000 - Joe decides to produce a biographies page and sends out for info.

21/08/2000 - Kimmo Herranen makes contact.

18/08/2000 - 150 down, 700 to go, search base 10885.

18/08/2000 - Joe makes his first mistake by giving Dan 4 numbers that had just been allocated to Brian. They each find the same 3 primes before the mess is sorted out. Dirk says a temporary farewell.

17/08/2000 - After a repeated posting to the mailing list to drum up further help, Brian Schroeder and Dan Morenus sign up.

16/08/2000 - Daval finally gives an update, including the second biggest exponent 92067.

14/08/2000 - Nestor breaks the biggest exponent record with a massive 116399 and pushes the search limit on k = 957977 to n = 310000.

11/08/2000 - 134 down, 716 to go, search base 10600.

07/08/2000 - 113 down, 737 to go, search base 10300.

03/08/2000 - 85 down, 765 to go, search base 10250.

30/07/2000 - Dirk beats Pavlos with an exponent of 91548

29/07/2000 - Pavlos finds a Keller prime with biggest exponent yet : 80422

28/07/2000 - Jim McE has so much work on that he produces his own status report

27/07/2000 - The on-line status report goes live. Phil finally reserves some values. Dirk comes up with 4 big primes, largest exponent 52853.

26/07/2000 - Dirk Augustin joins in.

25/07/2000 - Jim McE starts sending every prime he finds to the mailing list and gets his knuckles wrapped. He gets the first large subrange to cover : k = 447271 to 500000.

23/07/2000 - Pavlos Saridis climbs on board.

21/07/2000 - Phil Carmody, Jim McElhatton, Daval Davis and Nestor Melo all make initial contact. Daval takes some of the smaller values, Jim and Nestor dive in and Phil complains about everything.

21/07/2000 - 9 down, 841 to go, search base 10000.

21/07/2000 - Joe McLean completes search for Keller primes for all odd k between 78558 and 106 to an exponent limit of n = 10000 and uses Chris Caldwell's primes-l subscriber mailing list to seek collaborators to further the search. There are 850 values of k with no Keller prime for n 10000, of which Joe has already removed 9 for n > 10000.