is 2 1883023 - 1
has 566847 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8D21861F7F63B123double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.779968.6567%500000150000000.10155.0860%15.881470.2508%1.5941%
PrimeNet2570.010263.1579%90001600000.00143.0330%0.011664.2753%1.1174%
GPU722610.163165.5738%100001500000.00141.6920%0.164566.1563%0.5825%
Difference+6+15.6168+3.0829%+490000+14850000+0.1001+3.3941%+15.7169+4.0946%+4.0946%

Known prime factors (1 factor, 76.7 bits, 0.00407127% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18830231196293326378495437264632476.66331765234051270097
7 × 12402913 × 365872967
2015-12-02124029133658729679,740.52.49052.9287

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-15T10:51:00markrtiny2750006000000---0.046--3.931%
2015-10-07T17:47:09Bruno Victal5820K-linux5000001500000012---0.101--5.086%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-04-01T14:42:00Architects CubedManual testing260261--0.082--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.848--
2015-05-09T22:18:00snme2pm1Manual testing263264--1.043--
2015-05-09T22:18:00snme2pm1Manual testing264265--1.984--
2015-09-12T12:52:00ramgeisManual testing265266--3.968--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.784 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.784 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8010.015%
25500000.79745.057%
302500000.04995.188%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000422.910
50000500000010.069
50000660000021516.80


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computers8D21861F7F63B1230.102
2015-07-03T04:32:00MadPooManual testing8D21861F7F63B1230.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:30:37alpertronManual testing
119629332637849543726463
77AB1164800092__no
2017-10-19T22:23:56Oliver KruseThreadripper
119629332637849543726463
77AB1164800092__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
104
105
106
107
108
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
264
263
261
250
260
270
280
290
2100
Last modified: 2021-09-29T12:11:19+00:00