Report top-5000 primes for all k<=1001 - Page 51

MyDogBuster · 2009-04-25, 05:05

849*2^673024-1 is prime

MyDogBuster · 2009-04-26, 09:11

871*2^673565-1 is prime (202767 digits)

917*2^673570-1 is prime (202768 digits)

2 by 2 they come - Nice

mdettweiler · 2009-04-26, 13:44

Quote:

Originally Posted by MyDogBuster

871*2^673565-1 is prime (202767 digits)

917*2^673570-1 is prime (202768 digits)

2 by 2 they come - Nice

Only n=5 apart! Wow!

Gary, is this a new record?

Mini-Geek · 2009-04-26, 20:01

Quote:

Originally Posted by mdettweiler

... is [n=5] a new record?

I don't recall precisely, but I don't think so. I'm pretty sure that there's some that are n=0 to 2 apart. Still an extremely close pair, though, congrats!

kar_bon · 2009-04-26, 21:43

look here http://www.mersenneforum.org/showpos...18&postcount=2 for a small summary of different k-values with near n-values.

that last pair is quite remarkable and i think i have to update the summary the next days!

gd_barnes · 2009-04-28, 22:06

Quote:

Originally Posted by Mini-Geek

I don't recall precisely, but I don't think so. I'm pretty sure that there's some that are n=0 to 2 apart. Still an extremely close pair, though, congrats!

Yes it is a Riesel record for k<=1001 and n>600K according to Karsten's list in the link that he posted.

gd_barnes · 2009-04-28, 22:07

Here's one for one of the most prolific k's 300<k<=1001:

741*2^640175-1 is prime

MyDogBuster · 2009-04-29, 14:03

371*2^773762-1 is prime

MyDogBuster · 2009-04-29, 23:25

385*2^771627-1 is prime

vaughan · 2009-04-30, 06:32

Added 87961 : 417*2^667878-1 (201054 digits)

gd_barnes · 2009-05-01, 00:14

699*2^642289-1 is prime

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2009-04-25, 05:05	#551
MyDogBuster May 2008 Wilmington, DE 2²·23·31 Posts	849*2^673024-1 is prime

2009-04-26, 09:11	#552
MyDogBuster May 2008 Wilmington, DE 2²×23×31 Posts	8712^673565-1 is prime (202767 digits) 9172^673570-1 is prime (202768 digits) 2 by 2 they come - Nice

2009-04-26, 21:43	#555
kar_bon Mar 2006 Germany 2²·727 Posts	look here http://www.mersenneforum.org/showpos...18&postcount=2 for a small summary of different k-values with near n-values. that last pair is quite remarkable and i think i have to update the summary the next days!

2009-04-28, 22:07	#557
gd_barnes May 2007 Kansas; USA 24255₈ Posts	Here's one for one of the most prolific k's 300<k<=1001: 741*2^640175-1 is prime

2009-04-29, 14:03	#558
MyDogBuster May 2008 Wilmington, DE 2²·23·31 Posts	371*2^773762-1 is prime

2009-04-29, 23:25	#559
MyDogBuster May 2008 Wilmington, DE 2²×23×31 Posts	385*2^771627-1 is prime

2009-04-30, 06:32	#560
vaughan Jan 2005 Sydney, Australia 5×67 Posts	Added 87961 : 417*2^667878-1 (201054 digits)

2009-05-01, 00:14	#561
gd_barnes May 2007 Kansas; USA 28AD₁₆ Posts	699*2^642289-1 is prime