mersenneforum.org  

Go Back   mersenneforum.org > Search Forums

Showing results 1 to 9 of 9
Search took 0.01 seconds.
Search: Posts Made By: Yogi
Forum: Math 2005-01-27, 23:18
Replies: 3
Views: 571
Posted By Yogi
Indeed, there is. In 1939 J. Chernick...

Indeed, there is.

In 1939 J. Chernick introduced the formula

U_k(m) = (6m+1) x (12m+1) x Product[i=1..k-2, (9 x 2^i x m + 1)]

is a carmichael number with k factors if all factors are prime....
Forum: Math 2005-01-23, 17:14
Replies: 9
Views: 888
Posted By Yogi
Not really, since I used a self written program....

Not really, since I used a self written program. I attached it (in case you want to see it). I know it's not optimal, but it works.

And before I forget: You'll need NTL (Number theoretic library...
Forum: Math 2005-01-22, 08:26
Replies: 9
Views: 888
Posted By Yogi
What about 2 + 1 is divisable by 3? The...

What about 2 + 1 is divisable by 3?


The only examples I know are 1459 and 2999 (checked through 2454587).
Forum: Miscellaneous Math 2004-11-28, 21:34
Replies: 12
Views: 2,525
Posted By Yogi
If he restricts x to be greater 1, than this is...

If he restricts x to be greater 1, than this is correct and trivially x² + 2nx (for n natural) is always divisable by x. This looks like sieving out composites, which yields of course all prime...
Forum: Math 2004-10-26, 13:50
Replies: 9
Views: 2,995
Posted By Yogi
:redface: Yeah, I know. I sent it again, i hope...

:redface: Yeah, I know. I sent it again, i hope it will work now.
Forum: Math 2004-10-25, 22:57
Replies: 9
Views: 2,995
Posted By Yogi
I send it to your address. Did you get it, or was...

I send it to your address. Did you get it, or was it that bad ?
Forum: Math 2004-10-24, 23:37
Replies: 9
Views: 2,995
Posted By Yogi
Okay, then here is my list (except the three I...

Okay, then here is my list (except the three I already posted):

5,937,528,071,298,337 divides M79,301,333
14,442,281,421,126,743 divides M79,302,799
17,799,362,728,236,577 divides M79,302,869...
Forum: Math 2004-10-24, 20:59
Replies: 9
Views: 2,995
Posted By Yogi
Okay, thanks about that one. I downloaded the...

Okay, thanks about that one. I downloaded the files, decomp'd them and removed all factors from my database - below 79,3M, to be exact. But I have still 21 exponents beyond this which are not on the...
Forum: Math 2004-10-23, 16:46
Replies: 9
Views: 2,995
Posted By Yogi
New factors?

Hello, I am new to this forum and I have the following problem:

I have written a program for sieving Mersenne numbers and of course found a few factors. To my dishonour I must confess that I only...
Showing results 1 to 9 of 9

 
All times are UTC. The time now is 16:51.

Sat Nov 28 16:51:29 UTC 2020 up 79 days, 14:02, 4 users, load averages: 0.80, 1.21, 1.35

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.