9477*2^1127694-1 (339474 digits)

1113*2^1414802-1 (425901 digits)

2925*2^1302041-1 (391957 digits)
7th Drive.

4065*2^1346405-1 (405312 digits)

9687*2^1162829-1 (350051 digits)

Added [URL="http://primes.utm.edu/primes/page.php?id=116183"]116183[/URL] : 33*2^2939063-1 (884748 digits)

9751*2^1187603-1 (357509 digits)

4065*2^1349206-1 (406156 digits)

207*2^1453970-1 (437691 digits)

From Citrix's bunch of low weight Ks:

744716047603963*2^1884575-1 (567329 digits)

4151*2^1353222-1 (407365 digits)