105*2^801978-1 (241422 digits)

Nice find, Carlos. Is that your largest?
-Curtis

[quote=VBCurtis;117867]Nice find, Carlos. Is that your largest?
-Curtis[/quote]

Yes and the first from the quad-core. Waited three weeks for this....lol

one more prime to find for 2nd place in number of primes in TOP5000!

[quote=kar_bon;117872]one more prime to find for 2nd place in number of primes in TOP5000![/quote]

And RPS is now in second place.....

Another for k=243...
 

243*2^539016-1 is prime (162263 digits)

3615*2^431307-1 (129840 digits)

3335*2^432096-1 (130078 digits)

243*2^616662-1 is prime! (185637 digits)

131*2^603738-1 (181746 digits)

201*840735-1 is prime. (253089 digits)
Lucky month for me so far!
-Curtis