is 2 1825261 - 1
has 549459 decimal digits
takes 0.099 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
Actual26716.279368.6567%500000150000000.10155.0670%16.380770.2449%1.5882%
PrimeNet2570.010563.1579%80001500000.00122.8777%0.011864.2181%1.0602%
GPU722610.168365.5738%90001400000.00131.5938%0.169666.1224%0.5487%
Difference+6+16.1110+3.0829%+491000+14860000+0.1002+3.4732%+16.2112+4.1224%+4.1224%

Known prime factors (4 factors, 231.8 bits, 0.01269924% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1825261751604185824231446.09520588951
19 × 101 × 10729
-101107297.616e-65.349e-58.585e-5
1825261215602265970424571754.2595906066748
22 × 3 × 492172229
2014-11-1344921722290.00192.10933.9396
182526124950901749881132391961.114683488601079
3 × 29 × 7856190817
2016-04-012978561908170.276833.67062.886
182526114800710518758131143032270.326405440934714491
13 × 23 × 1355989748209
2019-10-18231355989748209226.515,811.410,854

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1825261162047565576560048719628493331131100.354
182526118753202195299764106167577899809733107.209
18252615379470955279803725789508800678822335115.373
182526111124275979071322000756196012569616936116.421
18252613191066725816551202464643311428496247138124.585
1825261369291073981966337077690088085461455741740131.440
1825261404323288750816967175225986859202052033483120432949161.468
182526123984191083681403534589842250093490641558635752472
33
52170.680
182526127756071699237129538486865434759596909433389468048
1391
54177.535
182526179619992353163643101491334372367463751703831390213
253569
56185.699
182526159842719527930978442175336209047936643352835201485
49837168205625417687
70231.794
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:38:44alpertronManual testing5000001500000012-
skipped known factor: 75160418582423
--0.101--5.067%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2014-11-13T12:15:00TJAOIManual testing254255*54.259170.0010.2090.001
2016-04-01T11:52:09TJAOIManual testing261262*61.114190.1090.2010.221


ECM factoring results:

Old Calculation Method

Total ECM effort:20.275 GHz-days
Estimated T-Level:24.732
DigitsB1CurvesCompleteFacMiss
2011000265 / 1002.6506.972%
2550000265 / 2800.94638.747%

New Calculation Method

Total ECM effort:20.275 GHz-days
Estimated T-Level:24.732
DigitsB1CompleteFacMiss
20110009.0490.012%
25500000.82044.054%
302500000.05195.055%
3510000000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000372.555
50000500000030.207
50000660000022517.51


Lucas-Lehmer results:
No L-L results for M1825261


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:34:58alpertronManual testing
75160418582423
21560226597042457
2495090174988113239
F6252D1E958223__no
2017-10-19T23:57:57Oliver KruseThreadripper
75160418582423
21560226597042457
2495090174988113239
F6252D1E958223__no
2019-10-19T19:44:51mnd927016b
75160418582423
21560226597042457
2495090174988113239
1480071051875813114303
D709AB8C5357A9C1no
2019-10-19T20:13:28ATHec2-PRPCFDC
75160418582423
21560226597042457
2495090174988113239
1480071051875813114303
D709AB8C5357A9C1no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
262
255
240
250
260
270
280
290
2100
Last modified: 2021-04-02T11:39:59+00:00