207*2^481385-1 is prime (144914 digits)

2151*2^339975-1 (102347 digits)

197*2^635042-1 is Prime.
-Curtis

Three primes
 

445419975*2^439597-1 (132341 digits)
261*2^618918-1 (186316 digits, 5th Drive)
173*2^828808-1 (249499 digits)

:w00t:

Congratulations [B]Kosmaj[/B]!
BTW: in 3 days two months will pass from my last reportable prime :sad:

Cruelty, thanks, they were found during last 10 days. Sorry to hear about your dry spell. Trying to diversify in terms of K might be a good idea.

In the meanwhile one more prime over here :smile:
445419975*2^444256-1 (133744 digits)

The previous prime for k=445419975 was at 301k and nothing until n=439597 the other day and 444256 now :surprised

85*2^656039-1 (197490 digits)

Another one from 207.
207*2^507833-1 is prime (152876 digits) :w00t: :flex:

-Steven

1693514745*2^396746-1 (119442 digits)

One more from k=85:

85*2^683573-1 (205778 digits)

k=85 has a large primeless gap between 147k and 656k, and then 2 primes at 656k and now at 683k :surprised

BTW, I'm now using a new prover's code L323 with srsieve included.

111*2^791502-1 is prime. By far my biggest ever.
-Curtis