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Search: Posts Made By: paulunderwood
Forum: PARI/GP 2020-07-12, 13:49
Replies: 3
Views: 83
Posted By paulunderwood
? a=eval("(2^10443557-1)/37289325994807"); ?...

? a=eval("(2^10443557-1)/37289325994807");
? print(a)


HTH, depending on the context in which it is being used.

or simply:
? a=(2^10443557-1)/37289325994807;
? print(a)
Forum: Miscellaneous Math 2020-07-12, 01:56
Replies: 35
Views: 1,354
Posted By paulunderwood
"ABstruct" again :crank: How do you feel...

"ABstruct" again :crank:

How do you feel today?
Forum: Software 2020-07-11, 22:33
Replies: 429
Views: 25,807
Posted By paulunderwood
Since mtsieve is open source, you can have...

Since mtsieve is open source, you can have whatever headers you like. Alter and compile.

If that is impossible a simple Perl script to do the conversion is easy to write.
Forum: Twin Prime Search 2020-07-11, 06:23
Replies: 6
Views: 216
Posted By paulunderwood
Alles gut :smile: Your twin is now 9th...

Alles gut :smile: Your twin is now 9th (https://primes.utm.edu/top20/page.php?id=1).
Forum: Data 2020-07-09, 20:33
Replies: 519
Views: 44,538
Posted By paulunderwood
time ./pfgw64 -f0 -od...

time ./pfgw64 -f0 -od -q"(2^10443557-1)/37289325994807" | ../../coding/gwnum/lucasPRP - 1 2 10443557 -1
PFGW Version 4.0.0.64BIT.20190528.x86_Dev [GWNUM 29.8]

No factoring at all, not even...
Forum: Data 2020-07-09, 12:13
Replies: 519
Views: 44,538
Posted By paulunderwood
Will do...

Will do...
Forum: Data 2020-07-09, 06:59
Replies: 519
Views: 44,538
Posted By paulunderwood
Congrats! I'll leave it to ATH to do a Lucas test.

Congrats! I'll leave it to ATH to do a Lucas test.
Forum: Prime Gap Searches 2020-07-08, 21:27
Replies: 51
Views: 6,215
Posted By paulunderwood
James while John had had had had had had had had...

James while John had had had had had had had had had had had a better effect on the teacher...
Forum: Miscellaneous Math 2020-07-08, 16:04
Replies: 10
Views: 171
Posted By paulunderwood
For n > 1, N = 2^n +1 has to be a generalized...

For n > 1, N = 2^n +1 has to be a generalized Fermat prime (https://primes.utm.edu/top20/page.php?id=12) with b=2 i.e 2^(2^a)+1, but 2^a+1 can never be a power of 2 :smile:
Forum: Miscellaneous Math 2020-07-08, 15:42
Replies: 10
Views: 171
Posted By paulunderwood
n=0.

n=0.
Forum: Miscellaneous Math 2020-07-08, 06:56
Replies: 62
Views: 4,984
Posted By paulunderwood
Q=-1 and a 35/45 selfridge test?

Based on the solutions to x^2-a*x-1=0, the following test seems to have, where they exist, 6 solutions for n==1 mod 4, or 8 solutions for n==3 mod 4. (a<=(n-1)/2). I have only tested semiprimes! Are...
Forum: Software 2020-07-07, 20:33
Replies: 429
Views: 25,807
Posted By paulunderwood
It is not intuitive. WIBNI there was some kind of...

It is not intuitive. WIBNI there was some kind of drop-down selector for the types?

Unless Chris Caldwell spots the error or someone notifies him of it, your entry will not be right and it will...
Forum: Software 2020-07-07, 18:45
Replies: 429
Views: 25,807
Posted By paulunderwood
The comment to your twin primes should be "Twin...

The comment to your twin primes should be "Twin (p)" and "Twin (p+2)" -- you need to submit both. The UTM parser is very finickety.

Congrats!
Forum: Information & Answers 2020-07-06, 15:33
Replies: 2
Views: 163
Posted By paulunderwood
Ron was wrong, Whit is right...

Ron was wrong, Whit is right (https://eprint.iacr.org/2012/064.pdf)
Forum: And now for something completely different 2020-07-05, 19:25
Replies: 11
Views: 2,263
Posted By paulunderwood
2-3 weeks, maybe a month.

2-3 weeks, maybe a month.
Forum: Software 2020-07-05, 19:20
Replies: 429
Views: 25,807
Posted By paulunderwood
I think it is this one:...

I think it is this one: https://primes.utm.edu/bios/page.php?id=449
Forum: Software 2020-07-04, 20:01
Replies: 14
Views: 544
Posted By paulunderwood
Thanks Jean. It seems a little slower for...

Thanks Jean. It seems a little slower for 69*2^n-1 at ~7 million bits, but it should be more robust! :tu:
Forum: Information & Answers 2020-07-04, 10:38
Replies: 2
Views: 179
Posted By paulunderwood
I believe Primo can work on Windows through the...

I believe Primo can work on Windows through the Linux subsystem: WSL2 (https://docs.microsoft.com/en-us/windows/wsl/install-win10)
Forum: Computer Games 2020-07-04, 09:06
Replies: 39
Views: 5,457
Posted By paulunderwood
Ah yes, xbill...

Ah yes, xbill (https://en.wikipedia.org/wiki/XBill), play until you have index finger damage.
Forum: Computer Games 2020-07-04, 08:57
Replies: 39
Views: 5,457
Posted By paulunderwood
Abuse...

Abuse (https://en.wikipedia.org/wiki/Abuse_(video_game)) is good in that you can alter the Lisp source code to do things like make the monsters jump higher.
Forum: Computer Games 2020-07-04, 07:21
Replies: 39
Views: 5,457
Posted By paulunderwood
ASCII Star Trek which is part of the package...

ASCII Star Trek which is part of the package "bsdgames", and of course "wargames" are amongst my favourite old games
Forum: Miscellaneous Math 2020-07-04, 06:30
Replies: 35
Views: 1,354
Posted By paulunderwood
Maybe it should be in Abstract Algebra &...

Maybe it should be in Abstract Algebra & Algebraic Number Theory as it is not related to Mersenne Prime mathematics. :whistle:

Oops it is already in Number Theory.

"ABstruct" It would help if...
Forum: Information & Answers 2020-07-03, 04:40
Replies: 40
Views: 894
Posted By paulunderwood
A few people have had to reduce RAM clock speeds...

A few people have had to reduce RAM clock speeds on such systems as yours.

Keep the hardware.
Forum: Information & Answers 2020-07-03, 03:26
Replies: 40
Views: 894
Posted By paulunderwood
Did you drop the RAM frequency to 3000 MHz in...

Did you drop the RAM frequency to 3000 MHz in BIOS? This should make your system more stable and should cease any errors in runs of Prime95.
Forum: sweety439 2020-07-02, 17:55
Replies: 20
Views: 1,891
Posted By paulunderwood
How was this ~2,600,000 digit number tested?

How was this ~2,600,000 digit number tested?
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