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 Xyzzy 2021-06-02 00:06

June 2021

[url]https://www.research.ibm.com/haifa/ponderthis/challenges/June2021.html[/url]

 uau 2021-06-02 00:50

The second required property is completely meaningless as currently phrased. I assume it should say the numbers have to be at least 2.

 LaurV 2021-06-02 07:56

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.

 Dieter 2021-06-02 08:12

[QUOTE=LaurV;579751]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.[/QUOTE]

That's my opinion, too. I have only 246 under 2**64.

 retina 2021-06-02 08:20

[QUOTE=uau;579736]The second required property is completely meaningless as currently phrased. I assume it should say the numbers have to be at least 2.[/QUOTE][QUOTE=LaurV;579751]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.[/QUOTE]You are both correct.

The page has been edited to show "... > 1". Before it said "... ≥ 1"

 LaurV 2021-06-02 08:41

[QUOTE=retina;579755]The page has been edited to show "... > 1". Before it said "... ≥ 1"[/QUOTE]
Oh...

 swellman 2021-06-22 17:15

Fun problem. Believe I got a correct answer.

Anybody go for the bonus *?

 0scar 2021-06-22 20:10

My bottleneck is primality proving.
I used YAFU implementation of APR-CL for solutions with less than 2k digits.

 Dr Sardonicus 2021-06-23 01:14

[QUOTE=swellman;581555]Fun problem. Believe I got a correct answer.

Anybody go for the bonus *?[/QUOTE]Apparently. The page with the challenge currently lists fifty-seven solvers who earned the bonus.

 Yusuf 2021-06-23 04:31

[QUOTE=swellman;581555]Fun problem. Believe I got a correct answer.

Anybody go for the bonus *?[/QUOTE]

Solved it today, largest solution I found so far is greater than 10^545

 Kebbaj 2021-06-24 22:02

[QUOTE=Yusuf;581598]Solved it today, largest solution I found so far is greater than 10^545[/QUOTE]

10 ^ 545 good!
Go to the maximum yusuf.
we compare our max after the solution. if you want?

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