mersenneforum.org Malformed PRP-CF assignment from server
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 2021-05-09, 10:20 #1 ric     Jul 2004 Milan, Ita 2·7·13 Posts Malformed PRP-CF assignment from server Got assigned Code: PRP=,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.
 2021-05-09, 11:00 #2 ATH Einyen     Dec 2003 Denmark 7·11·41 Posts Yes, this is a known error with unknown cause: https://mersenneforum.org/showpost.p...&postcount=258 https://mersenneforum.org/showpost.p...&postcount=259
2021-05-20, 20:21   #3
ewmayer
2ω=0

Sep 2002
República de California

5×17×137 Posts

Quote:
 Originally Posted by ric 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?

 2021-05-20, 21:59 #4 ATH Einyen     Dec 2003 Denmark C5516 Posts 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
2021-05-20, 22:13   #5
ewmayer
2ω=0

Sep 2002
República de California

5·17·137 Posts

Quote:
 Originally Posted by ATH 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).

 2021-05-21, 08:34 #6 kruoli     "Oliver" Sep 2017 Porta Westfalica, DE 5·107 Posts Yes, the test does show up as using base 5 and type 1 on the results page: 3215747.
2021-05-21, 15:20   #7
ATH
Einyen

Dec 2003
Denmark

7×11×41 Posts

Quote:
 Originally Posted by ewmayer Yes, but in e.g. PRP=,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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