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Old 2017-12-26, 18:42   #1
jwr257
 
Dec 2017

3 Posts
Question M5 is prime!

I got this message buried in my work thread status.

What does this mean? When I looked at my recent results, there was
no mention of this.
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Old 2017-12-26, 20:46   #2
Batalov
 
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While M5 is certainly prime, this usually happens when the worktodo.txt file was edited externally, or if there was no space left on disk, or similar.
If something from that spectrum happened, the task file may have contained
Test=5
(that is that the line was truncated from, say, Test=51329897 or a similar, more decorated string)
so the program happily tested "2^5-1" and recorded the result in the results.txt
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Old 2017-12-26, 21:57   #3
Uncwilly
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It could also mean that 213-1 is prime (that is the fifth Mersenne prime). But not likely in a results file (unless it was used for testing the computer/software.)
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Old 2018-03-01, 22:53   #4
kriesel
 
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Quote:
Originally Posted by jwr257 View Post
I got this message buried in my work thread status.

What does this mean? When I looked at my recent results, there was
no mention of this.
(M5 is prime result)
2^5-1=31 is indeed prime. But you don't get fame or GIMPS credit for your computer redoing an already known Mersenne prime, even accidentally, long after its original discovery.
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