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Old 2020-07-15, 22:40   #474
rogue
 
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"Mark"
Apr 2003
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Quote:
Originally Posted by bchaffin View Post
I found another repunit which fails repeatedly when run with special modular reduction. This is using pfgw4.0.1, which uses square_carefully for the last 50 iterations. (See post https://www.mersenneforum.org/showpo...&postcount=415 for a previous case.)

In this case the offender is (10^4568899-1)/9:

Code:
Detected in MAXERR>0.45 (round off check) in prp_using_gwnum
Iteration: 15177501/15177550 ERROR: ROUND OFF 0.5>0.45
PFGW will automatically rerun the test with -a1
...
Detected in MAXERR>0.45 (round off check) in prp_using_gwnum
Iteration: 15177501/15177550 ERROR: ROUND OFF 0.5>0.45
PFGW will automatically rerun the test with -a6
(10^4568899-1)/9 ERROR DURING PROCESSING! (96541.0526s+0.0304s)
This could be a gwnum issue. Maybe George can comment on it. If anything I could set the number of "last" iterations to something more dynamic so that as the number of bits increases the number of "careful" steps increases.
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