is 2 2473147 - 1
has 744492 decimal digits
takes 0.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L01DEAD87BAC30424double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26824.100867.6471 %60000001800000001.55699.0184 %25.657770.5648 %
Target2630.645365.0794 %110008000000.00541.3791 %0.650865.5609 %
Difference+5+23.4555+2.5677 %+5989000+179200000+1.5514+7.6393%+25.0069+5.0038 %

Known prime factors (1 factor, 78.9 bits, 0.00319021% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24731475634455527317764950376712478.899113912669309947305
3 × 5 × 7 × 977 × 1110422277233
2021-02-14977111042227723324,7526,084.611,364

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-14ANONYMOUSv4_computers2048204800--0.0010.660%
2003-10-31Team Prime Ribv4_computers15000228750--0.0031.686%
2010-11-19JossManual testing2000020000--0.0020.620%
2010-12-10JossManual testing247314247314--0.0252.492%
2013-10-25David Campeaui5-2500k5950001606500012--0.1457.863%
2019-03-13Sid & AndyBullseye600000018000000012--1.55712.952%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-05-02ANONYMOUSv4_computers212590.016
2016-02-23Mark RoseManual testing2592600.031
2009-01-16Sturle Sundegraun.ifi2602610.062
2012-09-15Grant McCrackenhome2612620.124
2013-02-21dbaughManual testing2622630.397
2015-03-03VictordeHollanderManual testing2632640.794
2015-03-03VictordeHollanderManual testing2642651.511
2015-10-27ramgeisManual testing2652663.022
2017-07-22Gordon SpenceManual testing2662676.043
2019-06-03TJAOIManual testing26726812.09


ECM factoring results:
Total ECM effort:9.761 GHz-days
Estimated T-Level:21.914
DigitsB1CompleteFacMiss
20110004.1381.596%
25500000.38368.195%
302500000.02497.613%
3510000000.00199.887%


ECM Summary

B1B2factorcurvesGHz-days
500005000000978.748
50000500000030.275
50000675000070.737


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02ANONYMOUSv4_computers01DEAD87BAC304240.172
2018-05-29kkmrkkblmbrbkold01DEAD87BAC304240.172


PRP results:
dateuseridcompidcofactorsres64
2021-02-14mrhw
563445552731776495037671
7C7CFCAC9885881B


CERT results:
dateuseridcompid
2021-02-14curtischum110--27l


P-1 factor-bounds graph:
B1 = 6000000, B2 = 180000000 (P-1 stage 2)
B1 = 6000000 (P-1 stage 1)
B1 = 595000, B2 = 16065000 (P-1 stage 2)
B1 = 595000 (P-1 stage 1)
B1 = 247314 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=21.91 ~= 56-bit
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Last modified: 2024-02-29T14:28:04+00:00