is 2 1909987 - 1
has 574964 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L946072B6F7567D0Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.207069.1176%80000003200000001.96659.7352%33.173472.1241%3.0065%
PrimeNet2570.010163.1579%90001600000.00143.0410%0.011464.2782%1.1204%
GPU722610.160865.5738%100001700000.00151.7597%0.162366.1796%0.6058%
Difference+7+31.0461+3.5439%+7990000+319830000+1.9650+7.9755%+33.0111+5.9445%+5.9445%

Known prime factors (1 factor, 73.5 bits, 0.00384580% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1909987129405758835235166365932373.4543387608366843208
23 × 3 × 163 × 865953059009
2019-12-141638659530590091,779.43,711.36,931.6

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-14T21:58:00kurlykurlytop100000030000000---0.203--5.682%
2017-12-08T09:28:23mikrS066800000032000000012---1.966--9.735%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-04-14T00:00:00GrunwalderGIMPv4_computers21256--0.005--
2011-04-14T00:00:00GrunwalderGIMPv4_computers256257--0.005--
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2011-04-14T00:00:00GrunwalderGIMPv4_computers257258--0.010--
2011-04-14T00:00:00GrunwalderGIMPv4_computers258259--0.020--
2011-04-14T00:00:00GrunwalderGIMPv4_computers259260--0.040--
2011-04-14T00:00:00GrunwalderGIMPv4_computers260261--0.080--
2009-05-27T16:44:00Architects Cubedi4l_1260261--0.080--
2011-03-09T08:06:00GrunwalderGIMPGWPrime02261262--0.161--
2011-03-09T11:34:00GrunwalderGIMPGWPrime02262263--0.514--
2015-05-18T08:20:00omylistManual testing263264--1.028--
2015-05-19T20:57:00monstManual testing264265--1.956--
2015-09-01T08:49:00ramgeisManual testing265266--3.912--
2017-03-15T08:26:28Smok_bmvManual testing266267--7.825--
2019-04-27T00:32:11chuenkitManual testing267268--15.65--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.140 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.140 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5260.020%
25500000.77246.199%
302500000.04895.337%
3510000000.00299.781%


ECM Summary

B1B2factorcurvesGHz-days
500005000000573.956
50000500000010.069
50000660000019315.11


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-12-09T00:00:00ANONYMOUSv4_computers946072B6F7567D0C0.104
1999-01-10T00:00:00ANONYMOUSv4_computers946072B6F7567D0C0.104
2015-07-04T19:28:00MadPooManual testing946072B6F7567D0C0.104


PRP results:
dateuseridcompidcofactorsres64PRP
2019-12-15T01:44:33Yuji HASEGAWAvj20a
12940575883523516636593
BEAB30725ADA97A1no
2019-12-15T22:45:23Ivan MLAB
12940575883523516636593
BEAB30725ADA97A1no


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)
101
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104
105
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107
101
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104
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1010
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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: 2022-01-06T11:57:10+00:00