Congrats to Curtis on new primes
3803443215*2^383049-1
3803443215*2^380349-1

but exponents are so similar, I'm afraid one was a typo (?)

From the 2nd drive:
227*2^345918-1 (104135 digits)

From k<300:
147*2^464300-1 (139771 digits)

From choose your own k: 22932195*2^494150-1 (148762 digits)

From the 2nd drive: 239*2^356300-1 (107260 digits)

From the 2nd drive: 115*2^357829-1 (107720 digits)

Second drive:

181*2^334579 - 1 is prime! 100721 digits

My largest prime! :geek: :w00t:

22932195*2^485935-1 (146289 digits)

Another from the 2nd drive:
133*2^359915-1 (108348 digits)

From the 2nd drive:
187*2^379649-1 (114289 digits)

[QUOTE=Kosmaj]Congrats to Curtis on new primes
3803443215*2^383049-1
3803443215*2^380349-1

but exponents are so similar, I'm afraid one was a typo (?)[/QUOTE]
Yep-- I felt pretty dumb about 1 second after hitting "confirm" on the 380349 submission. It was removed from the list later that day, as it wasn't prime.

On the bright side, I found another prime later that week:
3803443215*2^390317-1.
This makes 11 primes above 200k for this k-value, with a range of about 10,000 left to search below 400,000. Is this unusually good? I only have it sieved to 500k.. should I consider a new sieve for this richness?
-Curtis

834405*2^257151-1 (77417 digits)