869688105*2^418774-1 (126073 digits)

759237765*2^268641-1 (80878 digits)

151515*2^303419-1 (91344 digits)

870667875*2^280741-1 (84521 digits)

26565*2^289274-1 (87085 digits)

151515*2^308258-1 (92801 digits)

Cruelty
 

[B]151515[/B] appears to be a good one! Several primes in a row, congrats!

But I wonder what happened to 759237765*2^268641-1. More than 2 days after the submission its verification is still [URL="http://primes.utm.edu/primes/page.php?id=76739"]In Process[/URL] :question:

[QUOTE=Kosmaj][B]151515[/B] appears to be a good one! Several primes in a row, congrats![/quote]
Yes, I'll keep my fingers crossed :smile:
BTW: I have another "fun" ideas - 12345*2^n-1 and/or 5*3^n-1. As soon as I have some free resources I will have a look at those.
[QUOTE=Kosmaj]But I wonder what happened to 759237765*2^268641-1. More than 2 days after the submission its verification is still [URL="http://primes.utm.edu/primes/page.php?id=76739"]In Process[/URL] :question:[/QUOTE]
Strange indeed, but it is mentioned there that they are unable to verify all results now - maybe we could propose them our own team-based double checking? I am already doing proth test on all of my discovered primes anyway...

I've verified 759237765*2^268641-1 using proth.
[quote]Continue: Test of file "prime.txt" at line 100, k*2^n-1.
759237765 268641
759237765*2^268641 - 1 may be prime. (a = 19)
759237765*2^268641 - 1 is prime! (P = 5, Q = -1) [80878 digits]
759237765*2^268641 + 1 factor : 7
759237765*2^268642 - 1 factor : 59
759237765*2^268640 - 1 is composite. (a = 7)
Done.[/quote]

[QUOTE=Cruelty]Strange indeed, but it is mentioned there that they are unable to verify all results now - maybe we could propose them our own team-based double checking? I am already doing proth test on all of my discovered primes anyway...[/QUOTE]

I think they mean that they can't verify all types of primes such as ones requiring the use of ECPP. There shouldn't be any problem with ours as they use LLR to verify them. I wonder if the process doing the LLR test has hung.

663301485*2^283108-1 (85233 digits)