is 2 1901839 - 1
has 572511 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.623868.6567%20000002620000001.27169.2335%16.895471.5508%2.8941%
PrimeNet2570.010163.1579%90001600000.00143.0386%0.011464.2774%1.1195%
GPU722610.161565.5738%100001600000.00141.7277%0.162966.1685%0.5948%
Difference+6+15.4623+3.0829%+1990000+261840000+1.2702+7.5059%+16.7325+5.3823%+5.3823%

Known prime factors (3 factors, 161.8 bits, 0.00850586% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1901839304294241928.18180
24 × 5
-16161.913e-111.259e-62.561e-6
190183926204883688675012011961.185688935385400
23 × 52 × 29 × 118781963
2016-04-07291187819630.20840.50910.9508
190183962409109911848299396332272.4021640756917695144
23 × 3 × 27847 × 2455017473
2021-04-03278472455017473655.6910.52419.651

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19018397973995192538643075248834412789.365
1901839189907327321114551719469955355331100.583
19018391635423466353719517505335907455638499923341133.587
1901839497649942407694118106172403409259758504539131715349161.768
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:45alpertronManual testing5000001500000012-
skipped known factor: 304294241
--0.101--5.092%
2021-04-06T23:08:45Dylan Delgadodesktoplinux100000071000000-
skipped known factor: 304294241
--0.379--7.162%
2021-06-29T23:13:41Dylan Delgadolaptop-i787502000000262000000-
skipped known factor: 304294241
skipped known factor: 2620488368867501201
--1.272--9.234%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-04-07T11:48:39TJAOIManual testing261262*61.185190.0470.2100.095


ECM factoring results:

Old Calculation Method

Total ECM effort:20.385 GHz-days
Estimated T-Level:24.732
DigitsB1CurvesCompleteFacMiss
2011000265 / 1002.6506.972%
2550000265 / 2800.94638.747%

New Calculation Method

Total ECM effort:20.385 GHz-days
Estimated T-Level:24.732
DigitsB1CompleteFacMiss
20110009.0490.012%
25500000.82044.054%
302500000.05195.055%
3510000000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000352.428
50000500000050.347
50000660000022517.61


Lucas-Lehmer results:
No L-L results for M1901839


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T19:04:07Oliver KruseGTX-0
304294241
2620488368867501201
400275BA021541__no
2017-11-09T09:03:46ATHec2-1xf
304294241
2620488368867501201
400275BA021541__no
2021-04-05T12:54:31daveward2005Davy
304294241
2620488368867501201
6240910991184829939633
840516328A7BAE32no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 262000000 (P-1 stage 2)
B1 = 1000000, B2 = 71000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
262
220
230
240
250
260
270
280
290
2100
Last modified: 2021-12-17T10:36:36+00:00