is 2 1552207 - 1
has 467261 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L13282F1457C68809double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26719.143068.6567 %100000002000000001.31819.7251 %20.461171.7049 %
Target2610.197965.5738 %65003000000.00151.0493 %0.199465.9350 %
Difference+6+18.9451+3.0829 %+9993500+199700000+1.3167+8.6758%+20.2618+5.7699 %

Known prime factors (1 factor, 86.5 bits, 0.00557285% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15522071095855992558324194554993292786.50235299930761758070752
25 × 23 × 6863 × 6988468956439
2016-07-076863698846895643914,886,50624,66046,058

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-29Team Prime Ribv4_computers20000290000--0.0022.370%
2013-12-05David Campeaui5-2500k9200002668000012--0.1509.993%
2015-03-25VictordeHollanderManual testing1000000020000000012--1.31814.732%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-10-25ANONYMOUSv4_computers212570.012
2003-08-08ANONYMOUSv4_computers212580.025
2010-04-30Architects Cubeda3_bu22602610.099
2010-07-04GrunwalderGIMPManual testing212631.028
2016-02-23Mark RoseManual testing2582630.905
2015-02-17snme2pm1Manual testing2632653.672
2015-10-11ramgeisManual testing2652664.814


ECM factoring results:
Total ECM effort:31.132 GHz-days
Estimated T-Level:25.718
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
500005000000593.177
50000500000019210.73
250000400000005017.22


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27Dry Creek Photov4_computers13282F1457C688090.069
2015-07-03MadPooManual testing13282F1457C688090.069


PRP results:
dateuseridcompidcofactorsres64
2017-10-01Oliver KruseGTX-0
109585599255832419455499329
F176EDFD84B2F037
2017-10-30kkmrkkblmbrbkold
109585599255832419455499329
F176EDFD84B2F037


CERT results:
No CERT results for M1552207


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 920000, B2 = 26680000 (P-1 stage 2)
B1 = 920000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
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109
1010
1011
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1013
TF factor-bounds graph:
266
265
263
261
258
257
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00