1389*2^1876376-1 (564849 digits)
1063*2^1876427-1 (564864 digits)

245*2[SUP]1407538[/SUP]-1 is prime. 423714 digits.

245*2[SUP]1730188[/SUP]-1 is prime (520841 digits).

After nearly a year without a prime, a nice run of 3 in a few weeks. :grin:

Added [URL="http://primes.utm.edu/primes/page.php?id=118606"]118606[/URL] : 2001*2^1277109-1 (384452 digits)

And another one:
Added [URL="http://primes.utm.edu/primes/page.php?id=118610"]118610[/URL] : 2001*2^1296278-1 (390222 digits)

4125*2^1445205-1 (435054 digits)

1053*2^1891799-1 (569492 digits)

123*2^1779728-1 is prime! (2nd megabit drive) :smile:

1131*2^1897379-1 (571172 digits)

1323*2^1899548-1 (571825 digits)

4023*2^1459958-1 (439495 digits)