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Forum: Factoring 2022-09-24, 17:45
Replies: 8
Views: 298
Posted By a1call
For the sake of completeness in regards to my...

For the sake of completeness in regards to my last post, according to Wilson’s theorem, n!+1 will always be divisible by Prime p if n=p-1, so the probability of it being Prime is much less than any...
Forum: Factoring 2022-09-24, 12:00
Replies: 8
Views: 298
Posted By a1call
n! grows large much faster than n^2 which means...

n! grows large much faster than n^2 which means there are much more primes greater than n that might divide n!+/-1 for large integers.
The probability of n!+/-1 being Prime approaches any random...
Forum: FactorDB 2022-09-16, 22:25
Replies: 11
Views: 724
Posted By a1call
The database would probably be not very useful...

The database would probably be not very useful without the query formats/syntax/exact-labels built into the web app. :smile:
Forum: FactorDB 2022-09-16, 20:57
Replies: 11
Views: 724
Posted By a1call
Assuming you mean "Whois Database", I could...

Assuming you mean "Whois Database",
I could find the entry easily at domaintools.com.
The registration is active. :smile:

ETA: Perhaps you are worried about the domain registrar, they must have...
Forum: Software 2022-09-16, 03:22
Replies: 6
Views: 327
Posted By a1call
Read the ABCFILEFORMAT file (or something...

Read the ABCFILEFORMAT file (or something similar)
And script a variable to increment with logical steps say by 2. There are no (simple) shortcuts. You will have to sieve (software does a basic...
Forum: Factoring 2022-09-08, 21:03
Replies: 13
Views: 565
Posted By a1call
Yes, I meant software. I appreciate the info....

Yes, I meant software. I appreciate the info. Thank you. :smile:
Forum: Factoring 2022-09-08, 16:58
Replies: 13
Views: 565
Posted By a1call
Isn’t the format of the composite a factor? Is...

Isn’t the format of the composite a factor?
Is the computing cost of similar sized Fermat-numbers, Mersenne-numbers and general-format-numbers the same?
Are the available tools/methods for...
Forum: Miscellaneous Math 2022-09-05, 02:31
Replies: 7
Views: 321
Posted By a1call
FWIW: :smile: So in conclusion: * If the...

FWIW: :smile:
So in conclusion:
* If the offset is not large enough and internal to eliminate the vertex curve there can parallel curves to a parabola
* Parabolas formed by parallel slicing planes...
Forum: Miscellaneous Math 2022-09-03, 17:17
Replies: 7
Views: 321
Posted By a1call
Yes those are all identical parabolas on parallel...

Yes those are all identical parabolas on parallel 2D planes. I also considered parallel cross sections of cones forming parabolas, see 4th image below:
...
Forum: Miscellaneous Math 2022-09-03, 00:41
Replies: 7
Views: 321
Posted By a1call
I am sorry but I take an issue with using...

I am sorry but I take an issue with using Offset-Lines to be equivalent/interchangeable with Parallel-Lines, despite the Wikipedia article stating just that:...
Forum: Miscellaneous Math 2022-09-02, 17:50
Replies: 7
Views: 321
Posted By a1call
Parallel Parabolas

It occurred to me, I thought about it, I googled it and found a lot of nonsensical "opinions"/definitions.
I think that any parallel parabola to any given parabola will have to superimpose it and...
Forum: Miscellaneous Math 2022-08-20, 05:55
Replies: 20
Views: 617
Posted By a1call
Yes indeed. They are a general format of ...

Yes indeed. They are a general format of
(a^q^n-1) / (a^q^(n-1)-1 for primes q
Fermat numbers are a subset of this format and we know how easy it is to find Fermat primes. :smile
Like Fermat...
Forum: Miscellaneous Math 2022-08-19, 01:27
Replies: 20
Views: 617
Posted By a1call
A false alarm with no small factors! :smile: ...

A false alarm with no small factors! :smile:

PFGW Version 3.8.3.64BIT.20161203.Win_Dev [GWNUM 28.6]

(3^(19^4)-1)/(3^(19^3)-1) is 3-PRP! (56.4782s+0.0033s)
...
Forum: Miscellaneous Math 2022-08-17, 20:40
Replies: 20
Views: 617
Posted By a1call
Finally had time to run the corrected code....

Finally had time to run the corrected code. :smile:



\\ EPP-340-A
ExpPower1=2
subtrExpPBy =1
ExpPower2=ExpPower1-subtrExpPBy
a=2
forprime(q=2,19,{
Forum: Miscellaneous Math 2022-08-17, 05:55
Replies: 20
Views: 617
Posted By a1call
Just realized my error in the code checking...

Just realized my error in the code checking valuation p instead of x.
Not getting any younger.:smile:
Forum: Miscellaneous Math 2022-08-17, 00:03
Replies: 20
Views: 617
Posted By a1call
FTR my hunch about the format of all factors...

FTR my hunch about the format of all factors seems to have been correct which at the least should facilitate the sieving. :smile:
Forum: Information & Answers 2022-08-15, 21:27
Replies: 40
Views: 3,279
Posted By a1call
1st SM and now Mr. Greathouse. Are the stars...

1st SM and now Mr. Greathouse. Are the stars lining up somewhere? :smile:

My 2 cents:
PFGW it’s the most efficient primality tester and you can script it so that it checks the 1st then and if and...
Forum: Miscellaneous Math 2022-08-14, 21:55
Replies: 20
Views: 617
Posted By a1call
Acknowledged with thanks. :smile:

Acknowledged with thanks. :smile:
Forum: Miscellaneous Math 2022-08-14, 21:35
Replies: 20
Views: 617
Posted By a1call
Thanks for the quick research sir. Perhaps I...

Thanks for the quick research sir.
Perhaps I will use this thread to list the PRP's at some point and ask for an update on the oeis since AFAIK they do not distinguish PRP'S from Primes..
Forum: Miscellaneous Math 2022-08-14, 21:05
Replies: 20
Views: 617
Posted By a1call
Thank you Batalov for the reply. Phi...

Thank you Batalov for the reply.

Phi function is foreign to me. I will try to read about it.

Is the 59 yield, the largest known Prime/PRP of the form (as listed in the eois)?

ETA: It seems...
Forum: Miscellaneous Math 2022-08-14, 19:59
Replies: 20
Views: 617
Posted By a1call
Probable primes of the form (2^(p^2)-1) / (2^p-1)

Hey all,
Are primes of the form:
(2^(p^2)-1) / (2^p-1)
Where p is a prime number. Example:
p=7 => 4432676798593
Studied/Researched?
If so how are they referred to as?
Are there any known...
Forum: Puzzles 2022-07-01, 17:51
Replies: 12
Views: 1,574
Posted By a1call
I see. I missed reading the sorted in the...

I see. I missed reading the sorted in the following statement:


Since we keep the cells in sorted order,


Thanks.
Forum: Puzzles 2022-07-01, 17:13
Replies: 12
Views: 1,574
Posted By a1call
Shouldn’t the last configuration in the example...

Shouldn’t the last configuration in the example be (0, 8, 7) rather than (0, 7, 8)?
Forum: Miscellaneous Math 2022-06-25, 02:25
Replies: 8
Views: 197
Posted By a1call
You are a very wise person charybdis. Thank...

You are a very wise person charybdis.

Thank you very much for your replies and nice to have you back. :smile:
Forum: Miscellaneous Math 2022-06-25, 00:12
Replies: 8
Views: 197
Posted By a1call
So here is a follow-up question. Knowing that...

So here is a follow-up question.
Knowing that semiprimes with proximal factors can be easily factored, isn't there a potential method of multiplying a complimentary integer to N that would result in...
Showing results 1 to 25 of 1000

 
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