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Search: Posts Made By: a1call
Forum: Lounge 2020-10-24, 19:47
Replies: 73
Views: 1,783
Posted By a1call
https://en.m.wikipedia.org/wiki/Codariocalyx_motor...

https://en.m.wikipedia.org/wiki/Codariocalyx_motorius

Realtime video:

https://youtu.be/Ta4I5Uwv9m0
Forum: ONeil 2020-10-23, 02:55
Replies: 26
Views: 346
Posted By a1call
Meant 2^p-1 If for any prime p 2*p+1 | 2^p-1...

Meant 2^p-1
If for any prime p
2*p+1 | 2^p-1
Then 2*p+1 is definitely prime.
The test is deterministic and computationally about as expensive as a PRP test for 2*p+1.
The time saved is not...
Forum: ONeil 2020-10-23, 02:53
Replies: 26
Views: 346
Posted By a1call
Meant 2^p-1 If for any prime p 2*p+1 | 2^p-1...

Meant 2^p-1
If for any prime p
2*p+1 | 2^p-1
Then 2*p+1 is definitely prime.
The test is deterministic and computationally about as expensive as a PRP test.
Forum: ONeil 2020-10-23, 02:32
Replies: 26
Views: 346
Posted By a1call
To see if 2p+1 divides 2*p-1 is computationally...

To see if 2p+1 divides 2*p-1 is computationally about as expensive as a PRP test. It is deterministic but not much, much faster than a PRP test and then a N-1 test.
I learned about it from SM and...
Forum: ONeil 2020-10-23, 01:49
Replies: 26
Views: 346
Posted By a1call
I think what he is referring to is that a factor...

I think what he is referring to is that a factor of 2^p-1 is prime if (single"f") it is equal to 2p+1.:smile:
Forum: Lounge 2020-10-21, 14:22
Replies: 73
Views: 1,783
Posted By a1call
I think it's time to change my hearing aid's...

I think it's time to change my hearing aid's battery.:smile:
Apologies for the misunderstanding.
Forum: Lounge 2020-10-21, 10:37
Replies: 73
Views: 1,783
Posted By a1call
Avocados can be poisonous to horses. Nasty stuff....

Avocados can be poisonous to horses. Nasty stuff.

https://ker.com/equinews/avocados-can-toxic-horses/
Forum: Lounge 2020-10-20, 11:12
Replies: 36
Views: 732
Posted By a1call
Sorry posting in my sleep again. Ment to type CFG...

Sorry posting in my sleep again. Ment to type CFG (Chronic Fatigue Syndrome).:smile:

ETA My point was don't try to memorize Avogadro's constant.
Forum: Lounge 2020-10-20, 11:00
Replies: 36
Views: 732
Posted By a1call
Welcome aboard and sorry for your loss. I used...

Welcome aboard and sorry for your loss.
I used to take avocadoes for breakfast. Then I found out they induce sleep which gave me CFG.:smile:
Goodluck with your prime search.
Forum: Lounge 2020-10-19, 05:03
Replies: 1,124
Views: 53,442
Posted By a1call
Yes, we have been doing just that for months now....

Yes, we have been doing just that for months now. It is quite obvious that all the measures at isolating and protecting the elderly has been very effectively paying off. The Death rate ratios of the...
Forum: Lounge 2020-10-19, 03:27
Replies: 1,124
Views: 53,442
Posted By a1call
The most at risk are cared for and live among the...

The most at risk are cared for and live among the rest of the people. They don't leave on another planet.
Forum: Math 2020-10-18, 03:22
Replies: 14
Views: 418
Posted By a1call
I'm sure it does. I never hid the fact that I am...

I'm sure it does. I never hid the fact that I am no mathematician.
Thank you for the correction. I will try to remember the notation.:smile:
Forum: Miscellaneous Math 2020-10-18, 00:35
Replies: 18
Views: 736
Posted By a1call
I love the book Paul. Thank you very much.

I love the book Paul.
Thank you very much.
Forum: Math 2020-10-17, 23:52
Replies: 14
Views: 418
Posted By a1call
I see, thanks for the explanation.:smile: ...

I see, thanks for the explanation.:smile:

"PRP Cofactor" title is probably not the best choice of words then.
Forum: Math 2020-10-17, 22:32
Replies: 14
Views: 418
Posted By a1call
Glad to have been of service if any. Otherwise...

Glad to have been of service if any.
Otherwise I'm just glad to have something to do with my new build.:smile:
Forum: Math 2020-10-17, 20:24
Replies: 14
Views: 418
Posted By a1call
If I read the merssene.org correctly, M117239 has...

If I read the merssene.org correctly, M117239 has no known factors and F117239 is a (Probable) semiprime. So any complete list will have to be exclusively less than 117239.:smile:
Forum: Math 2020-10-17, 18:23
Replies: 14
Views: 418
Posted By a1call
If I read the merssene.org correctly, M5807 is a...

If I read the merssene.org correctly, M5807 is a (Probable) semiprime and so is F5807.
If I read the merssene.org correctly, M14479 is a (Probable) semiprime and so is F14479.
If I read the...
Forum: Math 2020-10-17, 17:50
Replies: 14
Views: 418
Posted By a1call
I should stop posting in my sleep. Please...

I should stop posting in my sleep. Please disregard my post.
(3, 888793, 3432577, ... ) | F1277
Forum: Math 2020-10-17, 16:30
Replies: 14
Views: 418
Posted By a1call
We can only make an unbroken and minimal list of...

We can only make an unbroken and minimal list of integers exclusively less than 1277, since we don't know if M1277 is a semiprime or not.

ETA As far as the Mersenne number candidates are concerned...
Forum: Lounge 2020-10-13, 04:05
Replies: 73
Views: 1,783
Posted By a1call
Sorry for three incomplete link. Regardless, it...

Sorry for three incomplete link.
Regardless, it turns out Scottish engineers actually do deserve their good reputation.:smile:
Forum: Lounge 2020-10-12, 20:24
Replies: 73
Views: 1,783
Posted By a1call
Fax-Machines predate telephones by more than a...

Fax-Machines predate telephones by more than a decade.
This gentleman patented a Fax-Machine in 1843.:smile:
Oh, he also invented the Earth-Battery and the Electric-Clock.:smile:


...
Forum: Lounge 2020-10-12, 19:20
Replies: 73
Views: 1,783
Posted By a1call
The g-force of the Earth is 1 g. The g-force of...

The g-force of the Earth is 1 g.
The g-force of the sun is 28.02 g.

https://en.m.wikipedia.org/wiki/Surface_gravity
Forum: Lounge 2020-10-12, 18:28
Replies: 73
Views: 1,783
Posted By a1call
https://www.nims.go.jp/ldynamics/en/How_short.html

https://www.nims.go.jp/ldynamics/en/How_short.html
Forum: Puzzles 2020-10-12, 00:41
Replies: 32
Views: 677
Posted By a1call
Hint: They are all consecutive integers n for...

Hint: They are all consecutive integers n for which f1(n) and f2(n) are Twin-Prime-Pairs.:smile:
Forum: Puzzles 2020-10-11, 23:32
Replies: 32
Views: 677
Posted By a1call
oeis won't help you for this one: 4,...

oeis won't help you for this one:


4, 11,14, 17
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