4073*2^1460504-1 (439660 digits)

4025*2^1474366-1 (443832 digits)

[URL="http://primes.utm.edu/primes/page.php?id=118715"]118715[/URL] : 2013*2^1276311-1 (384212 digits)

4127*2^1477320-1 (444722 digits)

4143*2^1479570-1 (445399 digits)

4137*2^1484145-1 (446776 digits)

4137*2^1487814-1 (447881 digits)

4111*2^1490155-1 (448585 digits)

2175*2[SUP]1202773[/SUP]-1 is prime. 362075 digits, it should last a week or so on the top 5000.

I just purchased a 5820k w/2666mhz memory, so my pace of discovery should roughly double in 2015! :boxer:
A substantial upgrade from my Core2Quad @ 3.33 previous desktop.

4059*2^1730611-1 (520970 digits)

45*2[SUP]1957377[/SUP]-1 (589231 digits)