45*2^2958002-1 (890449 digits)

4185*2^2026400-1 (610011 digits)

4157*2^2029894-1 (611063 digits)

2745*2^1449470-1 (436338 digits)

4175*2^2032552-1 (611863 digits)

2955*2^1582609-1 is prime (476417 digits)

9075*2^1331605-1 is prime! (400,858 digits)

pretty close :smile:
8515*2^1524873-1 (459037 digits)
8515*2^1525105-1 (459107 digits)

99 · 2^3100087 - 1 (933222 digits)
99 · 2^3102401 - 1 (933918 digits)

It looks like VBCurtis and Cruelty are in competition: lets find two primes close as possible :)

Nice four primes :smile:

[QUOTE=VBCurtis;464881]99 · 2^3100087 - 1 (933222 digits)
99 · 2^3102401 - 1 (933918 digits)[/QUOTE]

There seems to be a discrepancy:

[url]http://primes.utm.edu/primes/page.php?id=123806&deleted=1[/url]