k357
 

[URL]http://primes.utm.edu/primes/page.php?id=114204[/URL]

357*2^1301704-1 is prime

k379
 

[URL]http://primes.utm.edu/primes/page.php?id=114212[/URL]

379*2^1302991-1 is prime

k319
 

[URL]http://primes.utm.edu/primes/page.php?id=114235[/URL]

319*2^1344059-1 is prime

573*2^1226854-1 is prime
593*2^1227476-1 is prime

[FONT=&quot]513*2^1229391-1 is Prime
My first in a while and as a consequence my largest.
[/FONT]

569*2^1232424-1 is prime

375*2^1319127-1 is prime

595*2^1234025-1 is prime
425*2^1240016-1 is prime

k319
 

[URL]http://primes.utm.edu/primes/page.php?id=114400[/URL]

319*2^1740047-1 is prime

423*2^1243214-1 is prime

Nice one -- written with just ones, twos, threes and fours. ;-)