June 2021

Xyzzy · 2021-06-02, 00:06

https://www.research.ibm.com/haifa/p.../June2021.html

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:

Originally Posted by LaurV

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.

retina · 2021-06-02, 08:20

Quote:

Originally Posted by uau

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

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"

LaurV · 2021-06-02, 08:41

Quote:

Originally Posted by retina

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

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:

Originally Posted by swellman

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.

Yusuf · 2021-06-23, 04:31

Quote:

Originally Posted by swellman

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

Kebbaj · 2021-06-24, 22:02

Quote:

Originally Posted by Yusuf

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?

2021-06-02, 00:06	#1
Xyzzy "Mike" Aug 2002 10000000100000₂ Posts	June 2021 https://www.research.ibm.com/haifa/p.../June2021.html

2021-06-02, 00:50	#2
uau Jan 2017 3²·11 Posts	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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2021-06-02, 07:56	#3
LaurV Romulan Interpreter Jun 2011 Thailand 7·1,373 Posts	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.

2021-06-22, 17:15	#7
swellman Jun 2012 2²·13·59 Posts	Fun problem. Believe I got a correct answer. Anybody go for the bonus *?

2021-06-22, 20:10	#8
0scar Jan 2020 36₁₀ Posts	My bottleneck is primality proving. I used YAFU implementation of APR-CL for solutions with less than 2k digits.