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Search: Posts Made By: Batalov
Forum: Miscellaneous Math 2022-08-18, 00:11
Replies: 18
Views: 399
Posted By Batalov
I would recommend squaring ($a*$a) externally,...

I would recommend squaring ($a*$a) externally, like this

ABC (2^$a-1)/(2^$b-1)
3481 59

And with this form, prefactor; and even better - prefactor each in its own workunit with option
-N -k -l...
Forum: Miscellaneous Math 2022-08-16, 22:26
Replies: 18
Views: 399
Posted By Batalov
P.S. (which is a bit different and deserves a...

P.S. (which is a bit different and deserves a separate post)
Phi(3*p,b) is also easily shown to be identical to Phi(3,b^p), which in turn is frequently 'simplified' to avoid Phi()
b2p + bp + 1....
Forum: Miscellaneous Math 2022-08-16, 22:03
Replies: 18
Views: 399
Posted By Batalov
Cool I vaguely remember coding something into a patch...

I vaguely remember coding something into a patch to P95 (and then George vetted it and merged it to the trunk).
The idea was to simplify the "task description". But I think it was only for...
Forum: Miscellaneous Math 2022-08-16, 15:50
Replies: 18
Views: 399
Posted By Batalov
Found a newer, larger one (was not in factorDB...

Found a newer, larger one (was not in factorDB and big enough for PRPtop) -
(1126^24649-1)/(1126^157-1) (http://factordb.com/index.php?id=1100000003846934287) (74739 digits)
Forum: Miscellaneous Math 2022-08-14, 21:26
Replies: 18
Views: 399
Posted By Batalov
There are some larger ones, e.g.: ...

There are some larger ones, e.g.:
(130^6889-1)/(130^83-1) (http://factordb.com/index.php?id=1100000002319379461) and
(200^10201-1)/(200^101-1)...
Forum: Miscellaneous Math 2022-08-14, 20:29
Replies: 18
Views: 399
Posted By Batalov
One specific case of cyclotomic. Phip^2(2), or...

One specific case of cyclotomic. Phip^2(2), or equivalently, Phip(2p): A156585
Also with generalization, Phip(ap), where a>2, will produce some hits.

For any interestingly large numbers, - No....
Forum: Forum Feedback 2022-08-14, 17:25
Replies: 39
Views: 1,098
Posted By Batalov
Exclamation In short, you declare once again (and done plenty...

In short, you declare once again (and done plenty before) that you have no understanding of the words "intellectual property", "copyright", "license (https://ellipsa.eu/public/misc/license.html)" *,...
Forum: FactorDB 2022-08-13, 22:19
Replies: 573
Views: 108,634
Posted By Batalov
Syd (the DB owner) has various limits for his...

Syd (the DB owner) has various limits for his available resources. This one is above the limit (it would eat up more CPU time, that he has).
N+1 proof doesn't error - it rejects with the message...
Forum: Aliquot Sequences 2022-08-05, 01:30
Replies: 3,699
Views: 443,655
Posted By Batalov
Taking 199152

Taking 199152
Forum: Lounge 2022-08-04, 05:37
Replies: 119
Views: 7,292
Posted By Batalov
Talking too easy!

too easy!
Forum: And now for something completely different 2022-08-04, 01:37
Replies: 49
Views: 10,682
Posted By Batalov
Should this sequence be finite or infinite? ...

Should this sequence be finite or infinite?
[/QUOTE]
I have concerns about your reading comprehension.

Maybe A355956 tells something on this subject? Ah... wait...!
Forum: FactorDB 2022-08-04, 01:32
Replies: 573
Views: 108,634
Posted By Batalov
It's not just you! factordb.com...

It's not just you! factordb.com (https://downforeveryoneorjustme.com/factordb.com) is down.
Forum: And now for something completely different 2022-08-02, 22:59
Replies: 49
Views: 10,682
Posted By Batalov
Lightbulb {parody of some folks' posts} But... but.. if...

{parody of some folks' posts}
But... but.. if you sum up 1000007396's digits you will get 26.
Therefore, the digital root is 8.
If you take the digital root of p(1000007396) you will also get 8....
Forum: Proth Prime Search 2022-08-01, 16:08
Replies: 16
Views: 3,106
Posted By Batalov
19061965*2^1840922+1 is prime :rolleyes:

19061965*2^1840922+1 is prime :rolleyes:
Forum: NFS@Home 2022-07-31, 17:36
Replies: 106
Views: 6,765
Posted By Batalov
2,1416+ is done

2,1416+ cofactor =
p110 factor: 32312139386459660237589835506395782331854721499061954474461527504052156188529138203172395312834444925463648513
p132 factor:...
Forum: Software 2022-07-30, 18:20
Replies: 663
Views: 58,400
Posted By Batalov
Because such FFT doesn't exist. FFT are...

Because such FFT doesn't exist.
FFT are implemented for a certain list of sizes. In vicinity of "122" there are: 120, 128, 144 and so on.

Longer answer: "still why not 122?"
Because FFT is an...
Forum: Lounge 2022-07-27, 23:15
Replies: 13
Views: 318
Posted By Batalov
=

=
Forum: Chess 2022-07-26, 17:53
Replies: 5
Views: 357
Posted By Batalov
bAdqazixuRY

bAdqazixuRY
Forum: Lounge 2022-07-25, 21:12
Replies: 1,973
RIP
Views: 237,538
Posted By Batalov
Paul Sorvino...

Paul Sorvino (https://www.bbc.com/news/world-us-canada-62296883), actor
Forum: Linux 2022-07-25, 10:07
Replies: 21
Views: 568
Posted By Batalov
echo `wc -l a` `wc -l b` |awk '{print $1*100/$3...

echo `wc -l a` `wc -l b` |awk '{print $1*100/$3 "%"}'
Forum: Chess 2022-07-23, 21:43
Replies: 4
Views: 164
Posted By Batalov
Exclamation GM Magnus Carlsen's abdication

https://www.chess.com/news/view/carlsens-abdication-reactions-from-the-chess-world
______________
* just in case, unrelated note:
the last name Nepomniachtchi (Непо́мнящий) is a nice inside joke;...
Forum: And now for something completely different 2022-07-21, 11:51
Replies: 49
Views: 10,682
Posted By Batalov
Cool p(19439060)...

p(19439060) (http://factordb.com/index.php?id=1100000003809020989) and p(19439060)+4 (http://factordb.com/index.php?id=1100000003809021930) are cousin primes.

Work in progress: A355956 = 3, 5, 6,...
Forum: Miscellaneous Math 2022-07-20, 22:46
Replies: 27
Views: 1,241
Posted By Batalov
Lightbulb Re: 32 bits, and later 64 bit limit, and then higher.

Every road begins with a few first steps.

Just to give you, perhaps, a sandwich for the road (because this road is long), there are certain elements that can be used for 1) prototyping, 2)...
Forum: Miscellaneous Math 2022-07-19, 06:18
Replies: 27
Views: 1,241
Posted By Batalov
How about this, straight from Wikipedia (with...

How about this, straight from Wikipedia (with pseudocode changed into python):

def is_pow_onemod_fromWiki(P,D):
# return true if 2^Mp = 1 (mod D)
x=2
y=1
while (P > 1):
...
Forum: Miscellaneous Math 2022-07-18, 10:06
Replies: 27
Views: 1,241
Posted By Batalov
There is nothing that needs explaining. You are...

There is nothing that needs explaining. You are implementing exponentiation by millions of multiplications.

Instead, this method (https://en.wikipedia.org/wiki/Exponentiation_by_squaring) exists...
Showing results 1 to 25 of 1000

 
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