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Old 2021-06-02, 00:06   #1
Xyzzy
 
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Default June 2021

https://www.research.ibm.com/haifa/p.../June2021.html
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Old 2021-06-02, 00:50   #2
uau
 
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The second required property is completely meaningless as currently phrased. I assume it should say the numbers have to be at least 2.

Last fiddled with by uau on 2021-06-02 at 00:51
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Old 2021-06-02, 07:56   #3
LaurV
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What do you mean? That is the most important filtering criteria. Under a million, there are only about 40 numbers which suffice, and of them, less that a handful are prime.
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Old 2021-06-02, 08:12   #4
Dieter
 
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Quote:
Originally Posted by LaurV View Post
What do you mean? That is the most important filtering criteria. Under a million, there are only about 40 numbers which suffice, and of them, less that a handful are prime.
That's my opinion, too. I have only 246 under 2**64.
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Old 2021-06-02, 08:20   #5
retina
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Quote:
Originally Posted by uau View Post
The second required property is completely meaningless as currently phrased. I assume it should say the numbers have to be at least 2.
Quote:
Originally Posted by LaurV View Post
What do you mean? That is the most important filtering criteria. Under a million, there are only about 40 numbers which suffice, and of them, less that a handful are prime.
You are both correct.

The page has been edited to show "... > 1". Before it said "... ≥ 1"
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Old 2021-06-02, 08:41   #6
LaurV
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Quote:
Originally Posted by retina View Post
The page has been edited to show "... > 1". Before it said "... ≥ 1"
Oh...
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Old 2021-06-22, 17:15   #7
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Fun problem. Believe I got a correct answer.

Anybody go for the bonus *?
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Old 2021-06-22, 20:10   #8
0scar
 
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My bottleneck is primality proving.
I used YAFU implementation of APR-CL for solutions with less than 2k digits.
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Old 2021-06-23, 01:14   #9
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Quote:
Originally Posted by swellman View Post
Fun problem. Believe I got a correct answer.

Anybody go for the bonus *?
Apparently. The page with the challenge currently lists fifty-seven solvers who earned the bonus.
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Old 2021-06-23, 04:31   #10
Yusuf
 
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Quote:
Originally Posted by swellman View Post
Fun problem. Believe I got a correct answer.

Anybody go for the bonus *?
Solved it today, largest solution I found so far is greater than 10^545

Last fiddled with by Yusuf on 2021-06-23 at 05:18
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Old 2021-06-24, 22:02   #11
Kebbaj
 
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Quote:
Originally Posted by Yusuf View Post
Solved it today, largest solution I found so far is greater than 10^545
10 ^ 545 good!
Go to the maximum yusuf.
we compare our max after the solution. if you want?

Last fiddled with by Kebbaj on 2021-06-24 at 22:52
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