Thomas,

CONGRATS! The k=3 huge prime yesterday and the k=11 one today, you cannot deny that these two days have been very lucky for you.

Happy hunting!

(btw, where are those smilies, cannot find them...)

15
 

For the group's information, 15 is now at 505000 with no further primes. Sadly I have this running on a very slow machine.

Regards

Robert Smith

[B]11*2^743322-1[/B] is prime! :w00t:

My recent progress
 

k=7, checked to n=1012000, in progress
k=13, to 1000000 (1M), stopped
k=21, to 760000, in progress
k=35, [b]35*2^252910-1 is prime[/b], checked to 360000, in progress
k=53, to 520000, stopped
k=77, [b]77*2^387680-1 is prime[/b], checked to 388000, in progress

Happy hunting to all! :cool:

k=77
 

[B]77*2^441528-1[/B] is prime!

k=77 checked to 450000, continuing.

I'd like to congratulate Jeffrey (L38) on many primes he found recently, including the just reported [B]47*2^450470-1[/B] but I think it will be nice if he can post here the ranges he processed and the ranges he is working on now so that the others can better decide which k to check next. I see that he is actually informing Joss directly (as I don't remember he ever posted in this thread) but with a large delay. I wanted to mail him and tell him this directly but he has no e-mail address listed on his Top-5000 biography page. Posting above info will be greatly appreciated and will help the progress of the project.

We have others not reporting either, like g267 (Grobstich) on k=17, 63, 65 and possibly other k's and L33 (Chaglassian) on k=73, 103 etc. but there is little we can do about that.

I'm now working on k=55 and after some quick tests I found that
[B]55*2^218043-1[/B] is prime.

Current status:
k=55, to 220k, in progress
k=21, to 820k, in progress
k=35, to 420k, stopped
k=77, to 480k, in progress

Happy crunching!

update
 

Here's my recent activity:

[B]243*2^206302-1 is prime![/B]

241*2^n-1 200000 to 230000 11/3/4 [none] completed
243*2^n-1 200000 to 219000 11/5/4 [206302] continuing to 230000
245*2^n-1 200000 to 230000 11/2/4 [none] completed
247*2^n-1 200000 to 230000 11/1/4 [none] completed
249*2^n-1 200000 to 230000 11/1/4 [none] completed

Harvey563
:lol:

[QUOTE=Kosmaj]I'd like to congratulate Jeffrey (L38) on many primes he found recently, including the just reported [B]47*2^450470-1[/B] but I think it will be nice if he can post here the ranges he processed and the ranges he is working on now so that the others can better decide which k to check next.[/QUOTE]
Thanks! Ok, here goes. My upper limit is n=500k, except for k=9.

k=9: at 744k
k=33: at 410k
k=43: complete to 500k
k=51: at 475k ([B]51*2^468417-1 is prime![/B])
k=59: at 360k ([B]59*2^358276-1 is prime![/B])
k=69: complete to 500k
k=105: at 430k
k=117: at 363k

Completed previously: 47 (500k), 101 (500k), 109 (350k), 119 (500k), 289 (300k)

Jeffrey

Update on k=23

I have tested this one to n=1,000,000! I am still testing it to higher n's :smile:

Progress Report
 

Status of k's reserved before:
k=7: [to n=1050000] in progress
k=21: [850000] continuing to 1M
k=55: prime for n=[b]253047[/b] [280000] continuing to 520k
k=77: [520000] in progress

The following 7 k's I've been testing in the 210-400k range.
k=57: [b]239854[/b] [330000]
k=59: 358276 already reported by JCS [400000]
k=61: [280000]
k=67: [400000]
k=83: [b]216954[/b] [260000]
k=85: [370000]
k=87: [310000]

I "collided" with JCS at k=59 but I was using a machine without permanent access and I couldn't stop it earlier.