20050304, 19:41  #1 
"Mike"
Aug 2002
2·13·307 Posts 
Error message...
The attached test file generates an error with the new version of GMPECM... I'm using the packaged AMD64 Debian version...
http://debianamd64.alioth.debian.or...d64/g/gmpecm/ This is the code that it is having trouble with: Code:
# g1=1822795201 divides 185550750^3025009^30, doesn't work with Dickson echo 212252637915375215854013140804296246361  $ECM power 15 k 2 sigma 781683988 1000000 if ($status != 0) then echo "############### ERROR ###############"; exit 1; endif Code:
mv@k8:~/Desktop$ ./test.ecm ecm GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 137703491 (9 digits) Using B1=84, B2=1000, polynomial x^1, sigma=6 Step 1 took 0ms ********** Factor found in step 1: 137703491 Found input number N GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 3533000986701102061387017352606588294716061 (43 digits) Using B1=191, B2=225, polynomial x^1, sigma=1621 Step 1 took 0ms Step 2 took 0ms ********** Factor found in step 2: 291310394389387 Found probable prime factor of 15 digits: 291310394389387 Probable prime cofactor 12127960604037464813777571703 has 29 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 145152979917007299777325725119 (30 digits) Using B1=924, B2=117751, polynomial x^1, sigma=711387948 Step 1 took 2ms Step 2 took 6ms ********** Factor found in step 2: 59124358487827 Found probable prime factor of 14 digits: 59124358487827 Probable prime cofactor 2455045325301797 has 16 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 242668358425701966181147598421249782519178289604307455138484425562807899 (72 digits) Using B1=24780, B2=85507063, polynomial x^2, sigma=1417477358 Step 1 took 90ms Step 2 took 765ms ********** Factor found in step 2: 314189411150178070008866231673623 Found probable prime factor of 33 digits: 314189411150178070008866231673623 Probable prime cofactor 772363261821417470288502136863983499613 has 39 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 291310394389387 (15 digits) Using B1=2000, B2=119805, polynomial x^3, sigma=40 Step 1 took 2ms Step 2 took 6ms ********** Factor found in step 2: 291310394389387 Found input number N GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 3533000986701102061387017352606588294716061 (43 digits) Using B1=167, B2=211, polynomial x^1, sigma=3547 Step 1 took 1ms Step 2 took 0ms ********** Factor found in step 2: 291310394389387 Found probable prime factor of 15 digits: 291310394389387 Probable prime cofactor 12127960604037464813777571703 has 29 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 449590253344339769860648131841615148645295989319968106906219761704350259884936939123964073775456979170209297434164627098624602597663490109944575251386017 (153 digits) Using B1=172969, B2=20658299, polynomial x^2, sigma=63844855 Step 1 took 1406ms Step 2 took 547ms ********** Factor found in step 2: 241421225374647262615077397 Found probable prime factor of 27 digits: 241421225374647262615077397 Probable prime cofactor 1862264813902122131423372344559339567503391871088436708374700394762064021217072743463856958990845558484946068708307156081498461 has 127 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 17061648125571273329563156588435816942778260706938821014533 (59 digits) Using B1=174000, B2=69495900, polynomial x^2, sigma=585928442 Step 1 took 630ms Step 2 took 620ms ********** Factor found in step 2: 4562371492227327125110177 Found probable prime factor of 25 digits: 4562371492227327125110177 Probable prime cofactor 3739644646350764691998599898592229 has 34 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 89101594496537524661600025466303491594098940711325290746374420963129505171895306244425914080753573576861992127359576789001 (122 digits) Using B1=325001, B2=1032299, polynomial x^1, sigma=877655087 Step 1 took 2224ms Step 2 took 46ms ********** Factor found in step 2: 122213491239590733375594767461662771175707001 Found probable prime factor of 45 digits: 122213491239590733375594767461662771175707001 Probable prime cofactor 729065126875888654836271846897328714196046117321552802754910712464291427082001 has 78 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 5394204444759808120647321820789847518754252780933425517607611172590240019087317088600360602042567541009369753816111824690753627535877960715703346991252857 (154 digits) Using B1=345551, B2=184716334, polynomial Dickson(3), sigma=805816989 Step 1 took 2838ms ********** Factor found in step 1: 25233450176615986500234063824208915571213 Found probable prime factor of 41 digits: 25233450176615986500234063824208915571213 Composite cofactor 213771973590779703877582369062709101178538085915092060190430818668514532785234237012872011811995059836377330127389 has 114 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 242668358425701966181147598421249782519178289604307455138484425562807899 (72 digits) Using B1=854975, B2=85510503, polynomial x^2, sigma=1417477358 Step 1 took 3173ms Step 2 took 766ms ********** Factor found in step 2: 314189411150178070008866231673623 Found probable prime factor of 33 digits: 314189411150178070008866231673623 Probable prime cofactor 772363261821417470288502136863983499613 has 39 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 3923385745693995079670229419275984584311007321932374190635656246740175165573932140787529348954892963218868359081838772941945556717 (130 digits) Using B1=141667, B2=150814537, polynomial Dickson(3), sigma=876329474 Step 1 took 973ms Step 2 took 1665ms ********** Factor found in step 2: 662926550178509475639682769961460088456141816377 Found probable prime factor of 48 digits: 662926550178509475639682769961460088456141816377 Probable prime cofactor 5918281210244974807753908524217714036623152303854001660136533635338204743433806421 has 82 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 124539923134619429718018353168641490719788526741873602224103589351798060075728544650990190016536810151633233676972068237330360238752628542584228856301923448951 (159 digits) Using B1=1260317, B2=24289207, polynomial x^2, sigma=1604840403 Step 1 took 11393ms Step 2 took 581ms ********** Factor found in step 2: 148296291984475077955727317447564721950969097 Found probable prime factor of 45 digits: 148296291984475077955727317447564721950969097 Probable prime cofactor 839804700900123195473468092497901750422530587828620063507554515144683510250490874819119570309824866293030799718783 has 114 digits GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 5735013127104523546495917836490637235369 (40 digits) Step 1 took 937ms Step 2 took 5298ms ********** Factor found in step 2: 5735013127104523546495917836490637235369 Found input number N GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 17833653493084084667826559287841287911473 (41 digits) Step 1 took 1079ms Step 2 took 5032ms ********** Factor found in step 2: 17833653493084084667826559287841287911473 Found input number N GMPECM 6.0 [powered by GMP 4.1.4] [ECM] Input number is 212252637915375215854013140804296246361 (39 digits) Using B1=1000000, B2=839549779, polynomial x^15, sigma=781683988 Step 1 took 2356ms Step 2 took 3655ms ############### ERROR ############### 
20050304, 19:49  #2 
"Nancy"
Aug 2002
Alexandria
2,467 Posts 
This was a test for factors found by the BrentSuyama extension. Which factors that finds depends on a lot of internal parameters, and since most of those changed since 5.0.3, the test doesn't work anymore. In the ecm.test script in the ecm6.0.tar.gz file, this test is commented out. I'll alert Laurent Fousse to update the test scripts in the Debian packages.
Alex 
20050304, 20:17  #3 
"Mike"
Aug 2002
2·13·307 Posts 
My mistake... I was using the test script I had saved from the older version... I don't even know where the packaged version puts the new test scripts...

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