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Forum: Riesel Prime Search 2020-07-06, 06:06
Replies: 208
Views: 22,889
Posted By a1call
Congratulations carpetpool. It's good to see that...

Congratulations carpetpool. It's good to see that at least some of the Top 5k contributors are nice people.:smile:
Well done!
Forum: Information & Answers 2020-07-04, 22:02
Replies: 2
Views: 177
Posted By a1call
:smile:This has worked for me in the past: ...

:smile:This has worked for me in the past:

On Windows >> Install VirtualBox >> Install 32 bit (16 bit won't work) Ubuntu on a virtual computer >> Install Primo on the Ubuntu >> Start running Primo...
Forum: Lounge 2020-06-28, 05:33
Replies: 949
Views: 36,111
Posted By a1call
I wouldn't give much merits to any correlations...

I wouldn't give much merits to any correlations between the simplistic ABO-Grouping and Covid-19 resistance or lack thereof. It is now known that blood groups are much more varied and complex.
For...
Forum: Information & Answers 2020-06-21, 13:44
Replies: 18
Views: 644
Posted By a1call
I find this a very informative thread and the...

I find this a very informative thread and the posters responses extremely valuable. However, even the most efficient programming on a PC will have the overhead of a general purpose architecture which...
Forum: PARI/GP 2020-06-20, 03:00
Replies: 4
Views: 162
Posted By a1call
I hope it is temporary. Otherwise it is indeed a...

I hope it is temporary. Otherwise it is indeed a sad day for humanity.
Maybe Greathouse has more info.
Forum: Software 2020-06-18, 13:26
Replies: 12
Views: 320
Posted By a1call
Being from all over the word makes it reel...

Being from all over the word makes it reel difficult for dinner off is to figure out the mechanics of how that user could possibly know the answer.:smile:
Welcome to the forum. Prume95 is the...
Forum: Lounge 2020-06-15, 20:06
Replies: 39
Views: 852
Posted By a1call
Someone will have to keep a sorted list of all...

Someone will have to keep a sorted list of all the words used and check all new posts for duplicates. Should turn into a full-time job in no time.:smile:
BTW, can a sentence have repeated words?
Forum: Lounge 2020-06-15, 18:28
Replies: 39
Views: 852
Posted By a1call
OK, me first.:smile:

OK, me first.:smile:
Forum: PARI/GP 2020-06-15, 01:44
Replies: 46
Views: 916
Posted By a1call
That function is not documented to be present in...

That function is not documented to be present in the current stable version.
version 2.11.1.
https://pari.math.u-bordeaux.fr/dochtml/html-stable/



You would need the alpha version pari-2.12.0...
Forum: Math 2020-06-10, 00:07
Replies: 12
Views: 381
Posted By a1call
FWIW ...

FWIW

...
Forum: Puzzles 2020-06-03, 04:58
Replies: 16
Views: 1,211
Posted By a1call
You are correct of course, but only iff,...

You are correct of course, but only iff, (generic)-you decide to exclude 1 from the definition of one or the other by some twisted logic but not both.:smile:

Google >> define coprime numbers >>...
Forum: Puzzles 2020-06-02, 19:01
Replies: 16
Views: 1,211
Posted By a1call
Thank you LaurV, But I actually new about that...

Thank you LaurV, But I actually new about that function.
One day in elementary school my geometry teacher asked if anyone could prove some particular theorem. I raised my hand described a valid...
Forum: GPU to 72 2020-06-01, 23:25
Replies: 8
Views: 362
Posted By a1call
https://www.theregister.com/2020/02/07/google_chro...

https://www.theregister.com/2020/02/07/google_chrome_blocking/

so https should be warning free
Forum: Puzzles 2020-06-01, 21:58
Replies: 16
Views: 1,211
Posted By a1call
We cross posted. I stand corrected on 1. But, I...

We cross posted. I stand corrected on 1. But, I still think it's a matter of convention and not logic.:smile:
ETA: In the same way 1 was considered to be a prime number at some point until someone...
Forum: Puzzles 2020-06-01, 21:14
Replies: 16
Views: 1,211
Posted By a1call
Do you mean include 0? Pari-gp code: ...

Do you mean include 0?

Pari-gp code:

counter=0
for(i=2,278,{
if(gcd(278,i)<2,counter=counter+1);
})
counter
Forum: Miscellaneous Math 2020-05-31, 04:30
Replies: 20
Views: 616
Posted By a1call
Thank you Paul. I know it is small potatoes, but...

Thank you Paul. I know it is small potatoes, but the size would be a top 10 (20 counting twins as double) if it were a twin prime which is what I am aiming for.
I have a virtual-box instance which...
Forum: Miscellaneous Math 2020-05-31, 04:16
Replies: 20
Views: 616
Posted By a1call
FTR the number was proven prime via PFGW by using...

FTR the number was proven prime via PFGW by using the -tp flag, FactorDB says "Too big to be tested at the moment." for N+1 proof. I am not sure how temporary is the "at the moment" if at all.:smile:
Forum: Miscellaneous Math 2020-05-30, 22:41
Replies: 20
Views: 616
Posted By a1call
A 79820 dd Prime example found using PFGW: ...

A 79820 dd Prime example found using PFGW:

(20577!-2652)/2652 (http://factordb.com/index.php?id=1100000001517259328)

Currently waiting for FactorDB to process the number.
Stay tuned if not...
Forum: Hardware 2020-05-28, 17:37
Replies: 6
Views: 502
Posted By a1call
Why wouldn't supercomputers made of clusters of...

Why wouldn't supercomputers made of clusters of PCs on any network, say internet work?
What is the difference in the architecture?

Is this just a fancy name for distributed computing such as...
Forum: Miscellaneous Math 2020-05-20, 06:21
Replies: 20
Views: 616
Posted By a1call
This version should work though not using/being a...

This version should work though not using/being a minimal n:

DHS-200-B Any given pair of twin primes q & p where p = q+2 can be expressed as (n! +/- k)/(k) for infinite integers n such that:
n >=...
Forum: Miscellaneous Math 2020-05-20, 05:53
Replies: 20
Views: 616
Posted By a1call
This is wrong. At least if the k has to be an...

This is wrong. At least if the k has to be an integer.
Will see of I can come up with a correct version.
To be continued ...
Forum: Miscellaneous Math 2020-05-20, 03:56
Replies: 20
Views: 616
Posted By a1call
DHS-200-A Any given pair of twin primes q & p...

DHS-200-A Any given pair of twin primes q & p where p = q+2 can be expressed as (n! +/- k)/(k) for infinite integers n such that:
n >= r where r is the greatest prime factor of (q+1)
&
k =...
Forum: Miscellaneous Math 2020-05-20, 02:59
Replies: 20
Views: 616
Posted By a1call
DHS-190-A There are infinitely many distinct...

DHS-190-A There are infinitely many distinct twin-coprimes-to-n! (Please see post #9 (https://www.mersenneforum.org/showpost.php?p=545647&postcount=9)) of the form (n! +/- k)/(k), since for all...
Forum: Miscellaneous Math 2020-05-19, 18:29
Replies: 20
Views: 616
Posted By a1call
DHS-180-A For any given factorial n! if (n! +/-...

DHS-180-A For any given factorial n! if (n! +/- k)/(k) are both positive integers which are both coprime to n! & (n! +/- k)/(k) < n^2, then (n! +/- k)/(k) are twin primes

To-be-continued ...:smile:
Forum: Miscellaneous Math 2020-05-19, 18:11
Replies: 20
Views: 616
Posted By a1call
DHS-170-A For any given factorial n! greater than...

DHS-170-A For any given factorial n! greater than 4!, let v be the valuation of prime factor q of n!, where q >=5

Then we know that one of the (n! +/- q^v)/(q^v) will have a valuations of q that...
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