is 2 76928209 - 1
has 23157699 decimal digits
takes 216.895 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as D on 2024-03-13, 0.0% done, ETC 2024-03-17
1 primality tests remaining
ResidueStatus
L-LF47FF035B70C31__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27599.468264.0000 %655000116262505.12153.6142 %104.589665.3011 %
Target27449.732963.5135 %5000009000000021.97904.1960 %71.711965.0445 %
Difference+1+49.7352+0.4865 %+155000-78373750-16.8575-0.5818 %+32.8777+0.2566 %

Known prime factors:
No known factors for M76928209

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-05-09AnthonyRaisTest65500011626250--5.1213.983%


Trial Factoring results:
57585960616263646566676869707172737475
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-08-10ANONYMOUSv4_computers212531.56000e-5
2004-07-26markrv4_computers212620.004
2016-04-03Mark RoseManual testing262264
2010-09-24Matthijs Coster2642650.049
2010-09-25GrunwalderGIMPcompute-0-02652660.097
2010-09-29curtiscdoc203--15l2662670.194
2010-12-05NYC Pet AdoptionIS012672680.389
2010-12-08NYC Pet AdoptionIS012682690.777
2010-12-12NYC Pet AdoptionIS012692701.554
2013-01-02Clown_RoyalManual testing2702713.108
2013-10-06DRHManual testing27127318.65
2016-04-24Judge HaleManual testing27327424.87
2016-04-28AirSquirrelsManual testing27427549.74


ECM factoring results:
No ECM results for M76928209


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2017-06-26curtisccsc143-35lF47FF035B70C31__216.9


PRP results:
No PRP results for M76928209


CERT results:
No CERT results for M76928209


P-1 factor-bounds graph:
B1 = 655000, B2 = 11626250 (P-1 stage 2)
B1 = 655000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
275
274
273
271
270
269
268
267
266
265
264
262
253
this exponent TF target: 74
TF double-checked to: 67
250
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Last modified: 2024-03-29T03:34:27+00:00