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Old 2021-05-09, 10:20   #1
ric
 
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Jul 2004
Milan, Ita

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Default Malformed PRP-CF assignment from server

Got assigned
Code:
PRP=<aid>,1,2,3215747,-1,99,0,3,1,"4457025343,185822885311153245017,185822885311153245017"
from Primenet, and mprime complained with
Code:
185822885311153245017 does not divide exponent
which is clearly not true, and discarded the worktodo line.

Double-checked the assignment line from my assignments list, and realized that in there the recent factor was contained twice (hence the warning); wandering whether this depends from it being reported twice to the server. Removed the duplicate from the assignment line, changed the '99,0,3,1' to '99,0,5,1', now happily crunching.

I'm pretty confident this is a very corner-case, so I'm leaving this note mainly as a self-reminder.
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Old 2021-05-09, 11:00   #2
ATH
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Yes, this is a known error with unknown cause:
https://mersenneforum.org/showpost.p...&postcount=258
https://mersenneforum.org/showpost.p...&postcount=259
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Old 2021-05-20, 20:21   #3
ewmayer
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Quote:
Originally Posted by ric View Post
Removed the duplicate from the assignment line, changed the '99,0,3,1' to '99,0,5,1', now happily crunching.
PRP-CF n00b here - why change the PRP base from 3 to 5?
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Old 2021-05-20, 21:59   #4
ATH
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PRP-CF are usually run with type 5, because then if a new factor is found, only 1 more test is needed, because the residue will be the same with the new factor.

https://mersenneforum.org/showthread.php?t=25841
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Old 2021-05-20, 22:13   #5
ewmayer
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Quote:
Originally Posted by ATH View Post
PRP-CF are usually run with type 5, because then if a new factor is found, only 1 more test is needed, because the residue will be the same with the new factor.

https://mersenneforum.org/showthread.php?t=25841
Yes, but in e.g. PRP=<aid>,1,2,3215747,-1,99,0,3,1..., 3 is the PRP base and 1 is the PRP-test (and cofactor-post-test) residue type, no? The OP said he changed the 3 to 5, which would give a base-5 PRP-test with cofactor-test residue type 1, unless I need my eyes examined (which is certainly possible).
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Old 2021-05-21, 08:34   #6
kruoli
 
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Yes, the test does show up as using base 5 and type 1 on the results page: 3215747.
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Old 2021-05-21, 15:20   #7
ATH
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Quote:
Originally Posted by ewmayer View Post
Yes, but in e.g. PRP=<aid>,1,2,3215747,-1,99,0,3,1..., 3 is the PRP base and 1 is the PRP-test (and cofactor-post-test) residue type, no? The OP said he changed the 3 to 5, which would give a base-5 PRP-test with cofactor-test residue type 1, unless I need my eyes examined (which is certainly possible).
Sorry, I did not notice it was the wrong number changed. I assumed he changed the type to type 5, and I think that was the intention?
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