is 2 1901833 - 1
has 572509 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L82737CD23C0B8A78double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.340869.1176%80000003200000001.96659.7315%33.307272.1230%3.0053%
PrimeNet2570.010163.1579%90001600000.00143.0386%0.011464.2774%1.1195%
GPU722610.161565.5738%100001600000.00141.7277%0.162966.1685%0.5948%
Difference+7+31.1792+3.5439%+7990000+319840000+1.9650+8.0039%+33.1443+5.9544%+5.9544%

Known prime factors (2 factors, 157.5 bits, 0.00827918% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1901833685962364801233924682732375.86118034242880453592
23 × 13 × 53 × 4481 × 730152811
2021-12-1044817301528117,865.83.12965.8446
190183336536579956905326720011912581.596960562256436430715
5 × 293 × 960931 × 682331921
2020-02-29960931682331921450,0782.99585.4618

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
190183325062718788988143394407360950110405687588571314348157.456
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-03T00:00:00Jocelyn Larouchev4_computers20000160000---0.002--0.732%
2011-02-07T12:29:00Carsten Kossendeyleela1050001785000---0.015--2.280%
2011-06-16T17:55:00kurlykk100000030000000---0.203--5.680%
2017-11-24T09:07:24mikrS061800000032000000012---1.966--9.732%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-02-05T00:00:00GrunwalderGIMPv4_computers21256--0.005--
2011-02-05T00:00:00GrunwalderGIMPv4_computers256257--0.005--
2002-01-02T00:00:00Jocelyn Larouchev4_computers21258--0.020--
2011-02-05T00:00:00GrunwalderGIMPv4_computers257258--0.010--
2011-02-05T00:00:00GrunwalderGIMPv4_computers258259--0.020--
2011-02-05T00:00:00GrunwalderGIMPv4_computers259260--0.040--
2011-02-05T00:00:00GrunwalderGIMPv4_computers260261--0.081--
2009-05-24T13:19:00Architects Cubedi4l_1260261--0.081--
2011-01-14T03:25:00GrunwalderGIMPGWPrime02261262--0.162--
2011-01-14T06:53:00GrunwalderGIMPGWPrime02262263--0.516--
2015-05-16T12:25:00omylistManual testing263264--1.032--
2015-05-16T17:55:00monstManual testing264265--1.965--
2015-08-30T20:42:00ramgeisManual testing265266--3.929--
2017-03-03T09:31:41Smok_bmvManual testing266267--7.858--
2019-04-25T12:32:13chuenkitManual testing267268--15.72--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.800 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.800 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.4440.022%
25500000.76446.558%
302500000.04795.386%
3510000000.00299.783%


ECM Summary

B1B2factorcurvesGHz-days
500005000000936.452
50000500000020.139
500006600000594.618
500006600000977.592


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers82737CD23C0B8A780.103
2015-07-14T15:04:00MadPooManual testing82737CD23C0B8A780.103


PRP results:
dateuseridcompidcofactorsres64PRP
2020-03-01T12:18:41Christoph ZengerManual testing
3653657995690532672001191
61324458FB85F6A1no
2020-03-02T00:27:39Team_InspectorSpudBoy4
3653657995690532672001191
61324458FB85F6A1no
2021-12-12T23:10:10carlos56UMAMint
68596236480123392468273
3653657995690532672001191
61324458FB85F6A1no
2021-12-13T04:09:49carlos56UMAMint
68596236480123392468273
3653657995690532672001191
61324458FB85F6A1no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 105000, B2 = 1785000 (P-1 stage 2)
B1 = 105000 (P-1 stage 1)
B1 = 20000, B2 = 160000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
102
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106
107
102
103
104
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109
TF factor-bounds graph:
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267
266
265
264
263
262
261
260
259
258
257
256
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260
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2100
Last modified: 2021-12-13T04:09:49+00:00