is 2 1838909 - 1
has 553567 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF36B119E71D88319double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.158468.6567%278000027800000.21873.7487%16.377169.8317%1.1750%
PrimeNet2570.010463.1579%80001500000.00122.8817%0.011764.2196%1.0617%
GPU722610.167065.5738%90001400000.00131.5962%0.168366.1233%0.5495%
Difference+6+15.9914+3.0829%+2771000+2640000+0.2174+2.1526%+16.2088+3.7084%+3.7084%

Known prime factors (1 factor, 90.9 bits, 0.00494183% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
183890922716360114450465440339860012890.876617658625697369077000
23 × 53 × 59 × 49871 × 130957 × 1602949
2015-07-051309571602949171,180,9890.01660.0210

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-02T14:16:00Carsten Kossendeyleela1000001675000---0.015--2.493%
2014-05-19T21:00:00Jocelyn LaroucheManual testing134903134903---0.011--1.061%
2014-09-23T20:52:00Jocelyn LaroucheManual testing169806169806---0.013--1.200%
2015-07-05T22:22:00mikrMSI278000027800002890.8760.2190.2000.4373.749%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-20T13:13:00Architects Cubeda3_lm260261--0.084--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.868--
2015-04-27T03:38:00snme2pm1Manual testing263264--1.068--
2015-04-27T03:38:00snme2pm1Manual testing264265--2.032--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.219 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.219 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5730.019%
25500000.77646.020%
302500000.04895.313%
3510000000.00299.779%


ECM Summary

B1B2factorcurvesGHz-days
50000470000070.472
500005000000302.073
50000660000021416.67


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computersF36B119E71D883190.100


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T03:30:40Oliver KruseGTX-1
2271636011445046544033986001
7F57FD1470330F__no
2017-11-06T12:19:14kkmrkkblmbrbkc4.xlarge
2271636011445046544033986001
7F57FD1470330F__no


P-1 factor-bounds graph:
B1 = 2780000 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 169806 (P-1 stage 1)
B1 = 134903 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
104
105
106
107
104
105
106
107
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2021-06-04T15:56:24+00:00