is 2 3721621 - 1
has 1120320 decimal digits
takes 0.391 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
Actual26816.015867.6471%10000001303648501.22577.7197%17.241570.1446%2.4975%
PrimeNet2600.041363.3333%160003200000.00503.0868%0.046264.4651%1.1318%
GPU722640.956465.6250%220004500000.00692.1078%0.963366.3496%0.7246%
Difference+4+15.0594+2.0221%+978000+129914850+1.2188+5.6118%+16.2782+3.7950%+3.7950%

Known prime factors (2 factors, 126.7 bits, 0.00340400% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
372162131990766136967031651.507429796131
3 × 192 × 229 × 1733
-36117330.00016.636e-50.0001
3721621427258223139166984840972375.1785740216738071488
26 × 1201 × 149603 × 499189
2018-11-141496034991893,555.00.02570.0464

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
372162113668317896541166313421997070742683219139126.684
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-04-14T16:11:53Jocelyn LaroucheManual testing1000000130364850-
skipped known factor: 3199076613696703
skipped known factor: 42725822313916698484097
--1.226--7.720%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2022-03-09T23:05:47Jocelyn LaroucheManual testing267268--8.032--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.149 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.149 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.149


Lucas-Lehmer results:
No L-L results for M3721621


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T17:02:37kkmrkkblmbrbkManual testing
3199076613696703
D039AEDA4FBF68__no
2017-12-01T20:44:49Oliver KruseThreadripper
3199076613696703
D039AEDA4FBF68__no
2018-11-14T21:06:05Chang Chia-Tcheexbbbe-lt
3199076613696703
42725822313916698484097
C6F2BCA144C848__no
2018-11-16T00:02:48pewlaptop
3199076613696703
42725822313916698484097
C6F2BCA144C848__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 130364850 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
268
250
260
270
280
290
2100
Last modified: 2022-04-14T16:11:53+00:00