is 2 387203 - 1
has 116560 decimal digits
takes 0.004 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LC41BE9E6A4248D4Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26776.739971.6418 %100000061546947004.726910.5420 %81.466874.6313 %
Target2440.000056.8182 %700010000000.000912.7915 %0.000962.3418 %
Difference+23+76.7399+14.8236 %+993000+6153694700+4.7261-2.2495 %+81.4660+12.2895 %

Known prime factors (1 factor, 75.8 bits, 0.01957692% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
387203658873788871894158275532375.80285081183367883792
24 × 3 × 641 × 947 × 2920009577
2009-11-22947292000957719,7622.23634.1768

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-12-22ANONYMOUSv4_computers2000200000--0.00010.628%
2002-01-08ANONYMOUSv4_computers4096409600--0.00013.466%
2002-01-15ANONYMOUSv4_computers4096409600--0.00013.466%
2002-02-03ANONYMOUSv4_computers500001000000--0.00118.975%
2002-06-15ANONYMOUSv4_computers32768327680012--0.00321.600%
2002-08-24ANONYMOUSv4_computers65536655360012--0.00624.236%
2024-02-19Denial140i5-840010000006154694700
skipped known factor: 65887378887189415827553
--4.72744.409%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-01ANONYMOUSv4_computers2522530.002
2000-04-27ANONYMOUSv4_computers212540.006
2022-03-07LordJuliusManual testing254255
2001-03-17ANONYMOUSv4_computers212560.025
2002-01-28ANONYMOUSv4_computers212570.050
2004-01-18ANONYMOUSv4_computers212580.099
2008-12-29Sturle Sundeginara.ifi2582590.099
2009-01-10Sturle Sundegolli.ifi2592600.198


ECM factoring results:
Total ECM effort:10.447 GHz-days
Estimated T-Level:26.432
DigitsB1CompleteFacMiss
201100023.7830.000%
25500003.0174.892%
302500000.28675.100%
3510000000.02297.835%
4030000000.00199.860%


ECM Summary

B1B2factorcurvesGHz-days
10.028
5000050000002782.848
250000250000001447.571


Lucas-Lehmer results:
No L-L results for M387203


PRP results:
dateuseridcompidcofactorsres64
2017-09-23Oliver KruseOllaptop
65887378887189415827553
1420D391DF6834DB
2017-11-02kkmrkkblmbrbkc4.xlarge
65887378887189415827553
1420D391DF6834DB
2020-04-18Oliver KruseAddPrpType5
65887378887189415827553
7490D40E6818EF3B


CERT results:
No CERT results for M387203


P-1 factor-bounds graph:
B1 = 1000000, B2 = 6154694700 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 50000, B2 = 1000000 (P-1 stage 2)
B1 = 65536 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 2000, B2 = 200000 (P-1 stage 2)
B1 = 4096 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
260
259
258
257
256
255
254
253
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=26.43 ~= 71-bit
250
260
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280
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Last modified: 2024-02-29T14:28:04+00:00