4041*2^1617699-1 (486980 digits)

4067*2^1639338-1 (493494 digits)

Added [URL="http://primes.utm.edu/primes/page.php?id=120230"]120230[/URL] : 3645*2^1448922-1 (436173 digits)

This month's:
2115*2[SUP]1626565[/SUP]-1 (489649 digits)
2115*2[SUP]1631867[/SUP]-1 (491245 digits)
45*2[SUP]2205977[/SUP]-1 (664067 digits)

4103*2^1629508-1 (490535 digits)

4115*2^1676476-1 (504674 digits)

4135*2^1689399-1 (508564 digits)

4133*2^1699380-1 (511568 digits)

4175*2^1674484-1 (504074 digits)

4029*2^1824569-1 (549254 digits)

99*2[SUP]2455451[/SUP]-1 is prime! (739194 digits)