Congrats to David (c4) on the new record Mersenne cofactor:

(2^17683-1)/(234000819833373807217*62265855698776681155719328257)
(5274 digits)

Finding a 29-digit factor 62265855698776681155719328257 of a 5303-digit number is a major factoring achievement!

new GW
 

103444*27^103444-1 Generalized Woodall, ninth largest known.


Steven Harvey

[url=http://primes.utm.edu/primes/page.php?id=91136]27*2^1902689-1[/url]

Good ol' k=27 strikes again.
27*2^627794-1 was my first top-5000 prime, with an entrance rank of 198 that I still haven't beaten.

563528*13^563528-1 is now the biggest GW by far and breaks the base 13 duck at last.

Near-repdigits:
99999993*10^180207-1 180215 L184 Oct 2010 (Near-repdigit)
99999993*10^106947-1 106955 L184 Oct 2010 (Near-repdigit)

The first one is the second largest and missed being the largest by about 30 digits. The second is the 10th largest Near-repdigit.

Larry, congrats on nice primes. I hope you reclaim the NRD record soon.

I stopped all my "side" project a while ago. I found my last NRD more than 3 years ago ...

New record AP4 by Broadhurst - 9,000 digits longer than the previous one! :toot:
[URL]http://primes.utm.edu/primes/page.php?id=95651[/URL]

2^1667321-2^833661+1 (501914 digits) Gaussian Mersenne norm 38

[B]Cruelty[/B]

Congrats on a nice prime!
Can you share exe times, hardware details with us.

Thanks.

Thanks! :smile:
The search runs on single core of C2Q @ 3GHz. Single test using LLR takes ~4800 sec.