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Forum: Lounge 2003-08-20, 08:00
Replies: 447
Views: 31,462
Posted By S80780
98689 is a (base-10-) palindromic prime. 2

98689 is a (base-10-) palindromic prime.

2
Forum: Puzzles 2003-08-16, 11:55
Replies: 9
Views: 1,032
Posted By S80780
I'd also say 19 minutes. It is obvious that S1...

I'd also say 19 minutes.
It is obvious that S1 is always one of the two soldiers, as he is the fastest.
So the minimum time spend is

10 (S1 and S10 cross the river)
+1 (S1 returns)
+5 (S1 and...
Forum: Software 2003-08-09, 14:18
Replies: 4
Views: 894
Posted By S80780
Hi, kwstone! I don't think it will help...

Hi, kwstone!

I don't think it will help much. But it might be worth a try. Check the prime.ini file for an entry "priority=". Change the number following to 1 or enter it, if it's not listed. As I...
Forum: Puzzles 2003-08-03, 13:23
Replies: 15
Views: 1,201
Posted By S80780
Ok. The probability that she is HIV - positive is...

Ok. The probability that she is HIV - positive is
[code:1]
0.1 99
---- x -----
60 100 0.99 0.99...
Forum: Puzzles 2003-07-16, 05:48
Replies: 3
Views: 2,950
Posted By S80780
That's true. The only combination allowing each...

That's true. The only combination allowing each child to determine the color of its hat is One and Two wearing red hats and Three wearing a black hat. This way Three could state to wear a black hat...
Forum: Software 2003-07-11, 01:09
Replies: 44
Views: 5,186
Posted By S80780
So far, Prime95 23.6 is not uploaded. Just check...

So far, Prime95 23.6 is not uploaded. Just check out ftp://mersenne.org/gimps/ from time to time.

Benjamin
Forum: Teams 2003-06-30, 09:26
Replies: 5
Views: 8,403
Posted By S80780
Of cause, you can also copy the Prime95...

Of cause, you can also copy the Prime95 directory, delete local.ini and prime.ini and create the new team account. This way you can easily switch between the accounts by resetting the start at bootup...
Forum: Math 2003-06-22, 00:14
Replies: 12
Views: 1,558
Posted By S80780
No, each prime is factor of at most one mersenne....

No, each prime is factor of at most one mersenne. See Will Edgington's Mersenne Page (http://www.garlic.com/~wedgingt/mersenne.html) for a proof.

Benjamin
Forum: Software 2003-06-20, 22:06
Replies: 6
Views: 2,508
Posted By S80780
Hi, Joss! AFAIK, this is due to the fact...

Hi, Joss!

AFAIK, this is due to the fact that Prime95 doesn't go through the factor - candidates in their natural order. So, if a factor is found, Prime95 checks smaller left-overs to ensure that...
Forum: Software 2003-06-17, 18:25
Replies: 9
Views: 1,127
Posted By S80780
I just tried it out. Program output was: ...

I just tried it out. Program output was:
"Error: Work-to-do file contained composite exponent: 19922945"
I expect the primality test is the same as in decomp.c:
[code:1]
/* Return TRUE if arg is...
Forum: Lone Mersenne Hunters 2003-06-17, 15:27
Replies: 29
Views: 12,849
Posted By S80780
You got to type this in at the command line...

You got to type this in at the command line (Ensure you unzipped decomp.zip and nofactor.zip to the same directory and that your current dirotory is the one you unzipped to.).
If you want to LL-test...
Forum: Software 2003-06-17, 14:31
Replies: 9
Views: 1,127
Posted By S80780
Hi, flasholinos! If you run MPrime / Prime95...

Hi, flasholinos!

If you run MPrime / Prime95 on a comp with internet - access, you can let the program ask a central server, the "PrimeNet" sever, for an exponent to test. You can let the sever...
Forum: Lone Mersenne Hunters 2003-06-14, 21:25
Replies: 15
Views: 1,523
Posted By S80780
If prime95 detects a failure, it gives an output...

If prime95 detects a failure, it gives an output on the program window saying something like 'this or that failure was detected. Resuming work from last savefile.'. The same message is written with a...
Forum: Software 2003-06-14, 09:15
Replies: 17
Views: 2,133
Posted By S80780
Of cause, you can. But as LL - Testing is a...

Of cause, you can. But as LL - Testing is a serial type of work, you can't split up the LL - Test into several subtasks to work on. Besides, even if you could do so, it still would be better to let...
Forum: Miscellaneous Math 2003-06-13, 22:48
Replies: 5
Views: 3,311
Posted By S80780
How would you handle candidates of the form p=2^n...

How would you handle candidates of the form p=2^n + 1?
Except for n = 0 or some power of 2, they are all definitely composite.
If n is a power of 2, p might or might not be prime.
But your program...
Forum: Software 2003-06-12, 06:15
Replies: 17
Views: 2,133
Posted By S80780
Hi, DD! If you mean setting one machine up...

Hi, DD!

If you mean setting one machine up to test a number and another one to DC it - yes, you can. But you'd have to email the DC - result to George.

If you mean splitting up the test into...
Forum: Lounge 2003-06-09, 20:16
Replies: 15
Views: 1,363
Posted By S80780
Thanks for this hint. As a GIMPSter, I usually...

Thanks for this hint. As a GIMPSter, I usually think of LLR as - Residue instead of - Riesel.:D


No. Mersenne - (2^n - 1), Fermat - (2^(2^n) + 1), Proth - (k^n - 1), generalized Mersenne -...
Forum: Lounge 2003-06-09, 07:08
Replies: 15
Views: 1,363
Posted By S80780
To your first question: Prime95 is specialised on...

To your first question: Prime95 is specialised on Mersenne Numbers 2^p-1. To test numbers of a different form, there are other programs like PFGW...
Forum: Lounge 2003-06-09, 07:06
Replies: 885
Views: 80,375
Posted By S80780
... you start enumerating the 64bit LLRs of the...

... you start enumerating the 64bit LLRs of the Mersennes up to M7000000, because you just can't get to sleep.
Forum: Lounge 2003-06-08, 17:39
Replies: 15
Views: 1,363
Posted By S80780
True. But as the question was stated 2^p+1, I...

True. But as the question was stated 2^p+1, I expect the p to be prime.
Nevertheless, testing 16^n+1 might be interesting.

Benjamin
Forum: Teams 2003-06-08, 06:20
Replies: 3
Views: 2,431
Posted By S80780
Hi, Moises. To install a team, you need to...

Hi, Moises.

To install a team, you need to find other GIMPSters, e.g. by posting in this forum, who want to join your team or whos team you want to join.
All members of your team will use the...
Forum: Lounge 2003-06-08, 05:12
Replies: 15
Views: 1,363
Posted By S80780
Exept of p=2, 2^p+1=5, all these numbers can be...

Exept of p=2, 2^p+1=5, all these numbers can be divided by 3 = 2 + 1.
This is just a special case of this formula:

(a + b) * Sum(0 <= k <= 2n)[(-1)^k * a^(2n-k) * b^k] = a^(2n + 1) + b^(2n +...
Forum: Software 2003-06-06, 00:00
Replies: 4
Views: 620
Posted By S80780
I don't really know. My grandfather once bought a...

I don't really know. My grandfather once bought a book about Fabians, but this was only more or less a list of Fabians around the world. In an encyclopedia, I found the explanation "member of a roman...
Forum: Software 2003-06-05, 19:18
Replies: 4
Views: 620
Posted By S80780
According to the PrimeNet Status...

According to the PrimeNet Status (http://mersenne.org/primenet/status.txt), your worktodo.ini - entry should look like this:

DoubleCheck=9027259,64,1

Benjamin
Forum: Software 2003-06-05, 19:16
Replies: 1
Views: 453
Posted By S80780
According to the PrimeNet Status...

According to the PrimeNet Status (http://mersenne.org/primenet/status.txt), your worktodo.ini - entry should look like this:

DoubleCheck=9027259,64,1

Benjamin
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