is 2 4251787439 - 1
has 1279915555 decimal digits
takes 1,150,787.607 GHz-days to do one PRP test
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual282230.365960.9756%----230.365960.9756%
Target292235,894.707665.2174%200000009600000000212,689.82294.2609%448,584.530566.6994%
Difference-10-235,664.3417-4.2418%-20000000-9600000000-212,689.8229-4.2609%-448,354.1647-5.7238%

Known prime factors (7 factors, 360.1 bits, 0.00000847% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4251787439765321739031136.1559
32		2012-08-20992.199e-120.00350.0072
42517874393146322704871238.19537
37		2019-07-131379.371e-120.00120.0015
425178743939470278189473591651.810464161
41 × 11321		2019-07-1341113218.080e-80.25730.4521
4251787439165176839860223211753.8751942440
23 × 3 × 5 × 16187		2019-07-138161875.241e-70.34910.6463
4251787439251039901440103831754.4792952169
11 × 17 × 15787		2019-07-1317157871.114e-60.34390.6303
4251787439391062826668207911755.1184598805
3 × 5 × 306587		2019-10-0453065871.734e-66.557312.244
425178743916907273489854918276072270.518198825479077
151 × 167 × 1553 × 5077		2022-01-27155350770.10130.68481.2404

120 Composite Factors:
P-1 results:
No P-1 results for M4251787439


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2019-07-1323823938.195127.58725e-132,340,4201.842
2019-07-1325125251.810161.02471e-8249,3002.17825e-8
TF systematically completed to 64 but no per-exponent detailed record exists
2019-07-1325325453.875172.41900e-7249,3005.14209e-7
2019-07-1325425554.479175.49650e-7249,3001.16840e-6
2019-10-0525525655.118176.04749e-7249,3001.28552e-6
2022-01-27ramgeisr4mg31s27027170.518220.0562,340,4200.115
2022-01-30ramgeisr4mg31s27427538.195120.9002,340,4201.842
2022-01-30ramgeisr4mg31s27427536.155110.9002,340,4201.842
2022-02-15ramgeisr4mg31s275276--1.800--
2022-02-15ramgeisr4mg31s276277--3.599--
2022-02-17ramgeisr4mg31s277278--7.199--
2022-02-17ramgeisr4mg31s278279--14.40--
2022-02-27ramgeisr4mg31s279280--28.80--
2022-02-27ramgeisr4mg31s280281--57.59--
2022-04-14ramgeisr4mg31s281282--115.2--


ECM factoring results:
No ECM results for M4251787439


Lucas-Lehmer results:
No L-L results for M4251787439


PRP results:
No PRP results for M4251787439


P-1 factor-bounds graph:
100
101
102
103
104
100
101
102
103
104
105
106
TF factor-bounds graph:
282
281
280
279
278
277
276
275
271
256
255
254
252
239
this exponent TF target: 92
250
260
270
280
290
2100
Last modified: 2023-07-11T14:45:05+00:00