is 2 3152147 - 1
has 948891 decimal digits
takes 0.268 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as ECM on 2024-03-26, 0.0% done, ETC 2024-03-30
0 primality tests remaining
ResidueStatus
L-L25F98027089843C9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27075.805768.5714 %940000024089580900163.069814.3316 %238.875573.0756 %
Target2641.129265.6250 %1500012000000.00981.5444 %1.139066.1559 %
Difference+6+74.6765+2.9464 %+9385000+24088380900+163.0600+12.7872%+237.7365+6.9197 %

Known prime factors:
No known factors for M3152147

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2004-02-07ANONYMOUSv4_computers2048204800--0.0020.576%
2009-07-03Carsten Kossendeymother15000183750--0.0031.427%
2011-09-07Squeeky_SquirrelT7500_2200550009487506--0.0133.027%
2013-09-04Squeeky_SquirrelP4_260011000025025006--0.0304.236%
2015-11-24HBendtzManual testing5000001200000012--0.1396.897%
2019-05-03mikrMSI300000010000000012--1.02211.003%
2023-04-03Sid & AndySpeck940000024089580900--201.220.445%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-02-08ANONYMOUSv4_computers212590.012
2001-06-23David Campeauv4_computers212600.024
2009-04-09S485122USB-A2602610.049
2011-11-04markrManual testing212620.097
2013-01-07dbaughManual testing2622630.311
2015-02-11VictordeHollanderManual testing2632651.808
2015-06-17ThaManual testing2652662.371
2017-04-22Gordon SpenceManual testing2662674.741
2019-02-04TJAOIManual testing2672689.483
2021-06-14TJAOIManual testing26826918.97
2022-12-29mikrManual testing26927037.93


ECM factoring results:
Total ECM effort:13.785 GHz-days
Estimated T-Level:22.014
DigitsB1CompleteFacMiss
20110004.3481.293%
25500000.40366.848%
302500000.02597.486%
3510000000.00199.881%


ECM Summary

B1B2factorcurvesGHz-days
500005000000799.337
50000601858471.103
50000635000070.918
500006655790111.478
50000675000070.947


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-03-03ANONYMOUSv4_computers25F98027089843C90.268
1999-06-06foxkidv4_computers25F98027089843C90.268


PRP results:
No PRP results for M3152147


CERT results:
No CERT results for M3152147


P-1 factor-bounds graph:
B1 = 9400000, B2 = 24089580900 (P-1 stage 2)
B1 = 9400000 (P-1 stage 1)
B1 = 3000000, B2 = 100000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 500000, B2 = 12000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 110000, B2 = 2502500 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 55000, B2 = 948750 (P-1 stage 2)
B1 = 55000 (P-1 stage 1)
B1 = 15000, B2 = 183750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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1010
1011
TF factor-bounds graph:
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269
268
267
266
265
263
262
261
260
259
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=22.01 ~= 57-bit
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Last modified: 2024-03-28T07:02:06+00:00