is 2 1901507 - 1
has 572411 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-L20BADAAF7D9E8C09double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.346169.1176%80000003200000001.96659.7314%33.312672.1229%3.0053%
PrimeNet2570.010163.1579%90001600000.00143.0385%0.011564.2773%1.1194%
GPU722610.161565.5738%100001600000.00141.7276%0.163066.1685%0.5948%
Difference+7+31.1846+3.5439%+7990000+319840000+1.9650+8.0038%+33.1496+5.9544%+5.9544%

Known prime factors (1 factor, 83.2 bits, 0.00437361% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1901507108399463982052091797653592683.1652850356690300169597
3 × 193883 × 4900475527853
2020-09-0519388349004755278531,323,87521,00239,226

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-03T00:00:00Jocelyn Larouchev4_computers25000343750---0.003--1.009%
2011-02-02T07:28:00Carsten Kossendeyleela1050001785000---0.015--2.280%
2011-06-15T15:06:00kurlykk100000030000000---0.203--5.680%
2017-11-22T14:44:15mikrS060800000032000000012---1.966--9.731%


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--
2009-05-24T10:08:00Architects Cubedi4l_1260261--0.081--
2011-01-12T18:11:00GrunwalderGIMPGWPrime02261262--0.162--
2011-01-12T21:37:00GrunwalderGIMPGWPrime02262263--0.516--
2015-05-16T12:25:00omylistManual testing263264--1.033--
2015-05-16T17:55:00monstManual testing264265--1.965--
2015-08-30T20:42:00ramgeisManual testing265266--3.930--
2017-03-03T09:31:41Smok_bmvManual testing266267--7.860--
2019-04-25T12:32:13chuenkitManual testing267268--15.72--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.293 GHz-days
Estimated T-Level:24.393
DigitsB1CurvesCompleteFacMiss
2011000246 / 1002.4608.438%
2550000246 / 2800.87941.472%

New Calculation Method

Total ECM effort:18.293 GHz-days
Estimated T-Level:24.393
DigitsB1CompleteFacMiss
20110008.2440.026%
25500000.75347.114%
302500000.04795.409%
3510000000.00299.781%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001389.57
50000500000040.277
500006600000997.748
1000001000000050.694


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers20BADAAF7D9E8C090.103
2015-06-27T00:56:00MadPooManual testing20BADAAF7D9E8C090.103


PRP results:
dateuseridcompidcofactorsres64PRP
2020-09-07T21:10:12fre_gamesgpu
10839946398205209179765359
AF221EF152EB8FD2no
2020-09-15T08:43:41nordisweet16
10839946398205209179765359
AF221EF152EB8FD2no


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 = 25000, B2 = 343750 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
107
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
258
257
256
250
260
270
280
290
2100
Last modified: 2021-12-23T11:04:40+00:00