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Johnas Tsang
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Message 20419 - Posted: 29 Apr 2015, 17:04:05 UTC
Last modified: 29 Apr 2015, 17:05:21 UTC

Hello admin. Greetings from Hong Kong.

I'd like to know that if you have been keeping a full list of numbers of steps taken to reach one for all the many numbers we calculated? That would take up a great deal of storage space but may be useful for mathematicians' research.

Thanks in advance.
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Message 20422 - Posted: 1 May 2015, 9:55:34 UTC

Hello... Anyone's here?

Johnas Tsang
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Message 20423 - Posted: 1 May 2015, 9:58:39 UTC

One more question, does the admin switch the server everyday? Everyday there's a period of time in which the website shows a message saying "The server is down."

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Message 20424 - Posted: 1 May 2015, 13:09:37 UTC - in response to Message 20423.

The server is brought down to do backups of the database and file system daily.

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Message 20425 - Posted: 1 May 2015, 13:20:06 UTC - in response to Message 20419.

Hello admin. Greetings from Hong Kong.

I'd like to know that if you have been keeping a full list of numbers of steps taken to reach one for all the many numbers we calculated? That would take up a great deal of storage space but may be useful for mathematicians' research.

Thanks in advance.


I've had requests in the past to store the glide, delay, etc. for each number calculated. I just can't be done. I keep best result from each workunit, but keeping the results from every number would require 2GB of disk space for each large workunit. With 50,000 workunits completed per day, thats about 50 terabytes of additional storage required per day and I don't even have 50TB total! One also has to consider the bandwidth needed, the cost of the drives, the cooling needed, the electricity to power them all, and the space they would take up, it just isn't practical.

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Message 20426 - Posted: 2 May 2015, 5:36:51 UTC - in response to Message 20425.

Thanks for your reply. By the way, what is the goal of this project? I wonder if we'll stop crunching after reaching a certain number or we'll just keep going? And what have the old 3x+1@home project left for us except a conclusion that "all numbers smaller that 2,361,183,346,958,000,000,001 agree with the Collatz Conjecture"? What will this project leave for the people after us? Thanks.
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Message 20427 - Posted: 2 May 2015, 6:34:10 UTC - in response to Message 20425.

And I just found out that the Best Results page (http://boinc.thesonntags.com/collatz/highest_steps.php) was last updated in 2013. Is there any reason behind that?

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Message 20437 - Posted: 7 May 2015, 5:39:22 UTC - in response to Message 20427.

And I just found out that the Best Results page (http://boinc.thesonntags.com/collatz/highest_steps.php) was last updated in 2013. Is there any reason behind that?


Because a better result hasn't happened since then. The growth of the number of steps is very sporadic. We've been in a lull for quite some time.

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Message 20438 - Posted: 7 May 2015, 5:40:52 UTC - in response to Message 20426.

Thanks for your reply. By the way, what is the goal of this project? I wonder if we'll stop crunching after reaching a certain number or we'll just keep going? And what have the old 3x+1@home project left for us except a conclusion that "all numbers smaller that 2,361,183,346,958,000,000,001 agree with the Collatz Conjecture"? What will this project leave for the people after us? Thanks.


If we get lucky, it will give us the number that disproves the conjecture. Otherwise, lots and lots of BOINC credits which are, except for bragging rights, useless.

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Message 20441 - Posted: 8 May 2015, 15:30:37 UTC - in response to Message 20438.

Honestly, how possible do you think we'll eventually disprove the conjecture?

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Message 20443 - Posted: 8 May 2015, 21:08:48 UTC - in response to Message 20441.

Honestly, how possible do you think we'll eventually disprove the conjecture?


By finding a number that does not resolve to 4-2-1 but instead loops or goes into a random pattern.

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Message 20453 - Posted: 16 May 2015, 10:11:46 UTC - in response to Message 20443.

Yes I know. But how possible is that in your opinion?


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