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Search: Posts Made By: alpertron
Forum: Science & Technology 2021-10-22, 11:14
Replies: 6
Sticky: Poll: COVID vaccine type poll
Views: 343
Posted By alpertron
I received Sputnik in June and Moderna in...

I received Sputnik in June and Moderna in September, so I cannot complete the poll.
Forum: MattcAnderson 2021-10-20, 17:54
Replies: 24
Views: 639
Posted By alpertron
If you open my Polynomial factorization and roots...

If you open my Polynomial factorization and roots calculator (https://alpertron.com.ar/POLFACT.HTM), enter x^255-1 and press Factor, you will see after a few seconds the 255 roots of that polynomial,...
Forum: Programming 2021-10-11, 01:05
Replies: 24
Views: 1,242
Posted By alpertron
I think I understood your method. The contents of...

I think I understood your method. The contents of the priority queue and the sorted divisors are the following:


S1 = {1,2,4,8}, S2 = {1,3,9,27}

1,2,4,8 -> 1
3,2,4,8 -> 2
3,6,4,8 -> 3...
Forum: Programming 2021-10-10, 20:11
Replies: 24
Views: 1,242
Posted By alpertron
If you press the button Show more divisors you...

If you press the button Show more divisors you will see the divisor 7 in the second batch.

My application sorts the results inside batches.

The number 18! has 14688 divisors. The application...
Forum: Programming 2021-10-10, 17:37
Replies: 24
Views: 1,242
Posted By alpertron
I've just uploaded a new version of the Integer...

I've just uploaded a new version of the Integer Factorization Calculator (https://www.alpertron.com.ar/ECM.HTM) that includes the list of divisors. Each batch of 1000 factors is sorted using...
Forum: Programming 2021-10-08, 16:31
Replies: 24
Views: 1,242
Posted By alpertron
The algorithm posted to Stack Overflow requires...

The algorithm posted to Stack Overflow requires that all the divisors are present in memory. So it is not useful for me.

I will show unsorted divisors in my Web application. If the number of...
Forum: Programming 2021-10-05, 21:06
Replies: 24
Views: 1,242
Posted By alpertron
At this moment I have a lot of work. I will...

At this moment I have a lot of work. I will continue with this on the weekend.

Notice that the factorial of 100 was just an example. I really need to show the list of divisors of any integer...
Forum: Programming 2021-10-04, 11:21
Replies: 24
Views: 1,242
Posted By alpertron
I asked this problem in another forum and someone...

I asked this problem in another forum and someone pointed to https://stackoverflow.com/questions/29992904/enumerate-factors-of-a-number-directly-in-ascending-order-without-sorting . I will analyze...
Forum: Programming 2021-10-04, 03:15
Replies: 24
Views: 1,242
Posted By alpertron
All numbers between 1 and 100 are divisors of...

All numbers between 1 and 100 are divisors of 100! but it appears that there are missing divisors in your list.
Forum: Programming 2021-10-04, 01:24
Replies: 24
Views: 1,242
Posted By alpertron
Ok. Let's use an example: the number is 100! I...

Ok. Let's use an example: the number is 100! I know its complete factorization.

I want to show the first 1000 divisors, then the next 1000 divisors and so on.
Forum: Programming 2021-10-04, 00:56
Replies: 24
Views: 1,242
Posted By alpertron
From my first post, you can see that I cannot...

From my first post, you can see that I cannot sort the divisors.

There may be millions of divisors, but I have to generate the smallest 1000 of them. After the user presses a button, the program...
Forum: Programming 2021-10-04, 00:23
Replies: 24
Views: 1,242
Posted By alpertron
Thanks, but it does not help me. As a test,...

Thanks, but it does not help me.

As a test, I entered:


FORDIV(N)=
{ my(F = factor(N), P = F[,1], E = F[,2]);

forvec(v = vector(#E, i, [0,E[i]]), print(factorback(P, v)));
}
Forum: Programming 2021-10-03, 13:57
Replies: 24
Views: 1,242
Posted By alpertron
Computing divisors from complete factorization

I would like to generate the divisors of a number from its complete factorization in powers of prime numbers.

It is very easy to generate all of them if I do not need to be sorted, but I would...
Forum: Information & Answers 2021-09-21, 15:08
Replies: 5
Views: 630
Posted By alpertron
Furthermore, completely factor a Mersenne number...

Furthermore, completely factor a Mersenne number (if it cannot be done with trial factoring, P-1 or ECM) requires SNFS which runs a lot faster than GNFS. So factoring a n-bit Mersenne number is far...
Forum: Science & Technology 2021-09-14, 17:03
Replies: 274
Views: 23,085
Posted By alpertron
Today I received my second shot. This time was...

Today I received my second shot. This time was Moderna. On June 10th I received Sputnik.
Forum: Science & Technology 2021-08-29, 23:20
Replies: 274
Views: 23,085
Posted By alpertron
Today my 18 year old son received his first dose...

Today my 18 year old son received his first dose of Sputnik vaccine.
Forum: Information & Answers 2021-07-15, 17:50
Replies: 11
Views: 1,522
Posted By alpertron
It appears that there are some users actively...

It appears that there are some users actively performing PRP:


SRJ2877 LTOS 687109 C-PRP 2021-07-15 08:05
Oliver Kruse Krusen-NAS 687109 F-ECM 2021-07-15 01:42
...
Forum: mersenne.ca 2021-07-15, 14:32
Replies: 9
Views: 684
Posted By alpertron
A minor change in the header of the table. "Date"...

A minor change in the header of the table. "Date" should be "Date TF".
Forum: mersenne.ca 2021-07-15, 13:30
Replies: 9
Views: 684
Posted By alpertron
Yes, I see the new data. Thanks a lot.

Yes, I see the new data. Thanks a lot.
Forum: mersenne.ca 2021-07-15, 12:33
Replies: 9
Views: 684
Posted By alpertron
Thanks James for the new table. I assume that...

Thanks James for the new table. I assume that there are factors found by him using ECM with 71 bits and with more than 72 bits that are not shown in this table.

PS: It appears that the number of...
Forum: mersenne.ca 2021-07-15, 00:55
Replies: 9
Views: 684
Posted By alpertron
Yes, that's correct. Thanks in advance.

Yes, that's correct. Thanks in advance.
Forum: mersenne.ca 2021-07-14, 13:04
Replies: 9
Views: 684
Posted By alpertron
Proposed change on Summary of TJAOI TF activity on PrimeNet

By reading the page Summart of TJAOI TF activity on Primenet (https://www.mersenne.ca/tjaoi.php) we can see the number of factors found by this user classified by bit range.

I would like the table...
Forum: Science & Technology 2021-06-10, 18:12
Replies: 274
Views: 23,085
Posted By alpertron
Unfortunately in Argentina we cannot receive...

Unfortunately in Argentina we cannot receive vaccines from the USA. Pfizer is banned by law and Moderna and Johnson and Johnson are not approved by the government. So we can receive only Astra Zeneca...
Forum: Science & Technology 2021-06-10, 17:48
Replies: 274
Views: 23,085
Posted By alpertron
I've just received the first shot of Sputnik V....

I've just received the first shot of Sputnik V. The second dose will be in September.
Forum: News 2021-06-10, 12:26
Replies: 11
Views: 5,317
Posted By alpertron
I've just checked that I can select Mersenne...

I've just checked that I can select Mersenne Research on smile.amazon.com using my account, but the last time I used Amazon was in 2011, because it is very expensive for me.

I have to pay 65% of...
Showing results 1 to 25 of 1000

 
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