About a year ago, I had a reproducible error similar to this while trying to do P-1 factoring on M262143. I had added a list of all the known (to me) factors of M262143 to the lowm.txt file, and they apparently were ok because errors in this file are typically caught when the factoring is started. I tried a variety of P-1 limits, but the result at the end of stage 1 was always the same: ERROR: factor doesn't divide N! I also tried ECM factoring on the same number with the same error message result. Although I had encountered this error message a couple of times before whle doing ECM factoring on P66536, those errors were NOT reproducible: when I reran the program on the same seed, the program always ran ok to the end.
In case anyone else wants to try this, here is my list of factors from the lowm.txt file: M( 262143 )C: 7 M( 262143 )C: 7 M( 262143 )C: 73 M( 262143 )C: 127 M( 262143 )C: 337 M( 262143 )C: 439 M( 262143 )C: 3943 M( 262143 )C: 9199 M( 262143 )C: 24967 M( 262143 )C: 28729 M( 262143 )C: 36793 M( 262143 )C: 57457 M( 262143 )C: 262657 M( 262143 )C: 524287 M( 262143 )C: 1560007 M( 262143 )C: 2298041 M( 262143 )C: 8912863 M( 262143 )C: 15212471 M( 262143 )C: 30583351 M( 262143 )C: 54985393 M( 262143 )C: 302587921 M( 262143 )C: 1371458593 M( 262143 )C: 1380150703 M( 262143 )C: 10178663167 M( 262143 )C: 15382298807 M( 262143 )C: 27265714183 M( 262143 )C: 35473416481 M( 262143 )C: 47659091257 M( 262143 )C: 121323854647 M( 262143 )C: 520853887919 M( 262143 )C: 9361973132609 M( 262143 )C: 34088027693833 M( 262143 )C: 130066754524687 M( 262143 )C: 1406791071629857 M( 262143 )C: 2237717449946593 M( 262143 )C: 5271393791658529 M( 262143 )C: 671165898617413417 M( 262143 )C: 2762194134676763431 M( 262143 )C: 7032960672473811601 M( 262143 )C: 4815314615204347717321 M( 262143 )C: 207617485544258392970753527 M( 262143 )C: 42185927552983763147431373719 M( 262143 )C: 17140907466568806171723281481130659780805681 M( 262143 )C: 57037483740488228809445031801958262436578074081 M( 262143 )C: 29724614739876344125010817433703775877960388838436140673 M( 262143 )C: 61641347592475860688686002670152525762503468748858717047 M( 262143 )C: 144780974187086260903935034761413745643636578290924150417 M( 262143 )C: 20712014126148022558481993313919624102421323341432158275969 M( 262143 )C: 2537599745025519134156761164267591913521835535529224725592538658153 Phil Moore ------------------------------ Date: Fri, 24 May 2002 11:30:40 -0400 From: Jud McCranie <[EMAIL PROTECTED]> Subject: Mersenne: error result I've been in GIMPS since before the first one was discovered. Today I finished an exponent, and saw some stuff I haven't seen before. After it completed, it said M14776187 stage 1 complete ---transformations --- time starting stage 1 GCD stage 1 GCD complete ERROR: factor doesn't divide N! contacting server etc. What went wrong? It looks like at the end of the L-L test, it did a GCD, thought it found a factor, but it wasn't a factor. For a while during this exponent, I had quick user switching on with WinXP. When I realized that prime95 was running twice as slow, I figured out that quick switching was causing two copies of primr95 to run. Could that cause a problem? +---------------------------------------------------------+ | Jud McCranie | | | | Programming Achieved with Structure, Clarity, And Logic | +---------------------------------------------------------+ _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ End of Mersenne Digest V1 #963 ****************************** _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
