is 2 29881 - 1
has 8996 decimal digits
takes 0.000 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
Actual267994.408477.6119%500000000100000000000.812813.6945%995.221280.6779%3.0659%
PrimeNet2400.000062.5000%500100000.00004.0993%0.000064.0373%1.5373%
GPU722440.000165.9091%500100000.00001.7565%0.000166.5079%0.5988%
Difference+23+994.4083+11.7028%+499999500+9999990000+0.8128+11.9380%+995.2211+14.1700%+14.1700%

Known prime factors (4 factors, 266.1 bits, 0.89057780% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
29881179287617.4523
3
-135.847e-138.857e-101.626e-9
298816514575041700171549.21110900865168
24 × 127 × 1259 × 4261
2008-08-26125942610.00411.136e-62.047e-6
29881833571341870281567011622072686.1081394818349235771170663
1394818349235771170663
2009-05-1011394818349235771170663894,878,7366.070e+101.134e+11
298811317600067789429066310019511807287135113.343220474560387776357268836302635
32 × 5 × 29 × 127 × 2206778471 × 602817031886171
2017-10-0322067784716028170318861714.415e+1226,23448,994

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
298811167978615501298378792166.663
298811494485051698971713048126860640932103.559
29881236228563353763369011524468213393082297740130.795
298815430363059224656202533597138921282294751941135.318
29881973593501799210936583641030245779938779183895346152.770
29881858360451656346667848731162920104370516337930880749162.554
2988115389287029611142503859546400645675227676267861380
80609
55180.006
2988110983136565556083441188246802768498199239116078744
75817186297
61199.451
2988119691336054288535319203172045279557366469834044099
1145835879630239
66216.903
2988171550467349556184200783746946880482833711010181653
6441008540101633250657049
75248.662
2988112828068639699879596805915638865361125807545882438
1368899098129201520610550344063
81266.114
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2017-01-04T01:58:23kkmrkkblmbrbkManual testing5000000001000000000012-
skipped known factor: 179287
skipped known factor: 651457504170017
--0.813--13.695%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-10-25T00:00:00GrunwalderGIMPv4_computers??49.211150.0023.37317e-50.003
2008-08-26T19:59:00ANONYMOUSManual testing??49.211150.0023.37317e-50.003


ECM factoring results:

Old Calculation Method

Total ECM effort:19.119 GHz-days
Estimated T-Level:31.617
DigitsB1CurvesCompleteFacMiss
20110001221 / 10012.2100.000%
25500001221 / 2804.3611.267%
302500001096 / 6401.71318.017%
351000000511 / 15800.32372.360%
403000000500 / 47000.10689.907%

New Calculation Method

Total ECM effort:19.119 GHz-days
Estimated T-Level:31.617
DigitsB1CompleteFacMiss
2011000154.3540.000%
255000031.5360.000%
302500005.4620.425%
3510000000.79445.208%
4030000000.09890.639%
45110000000.01198.945%
50440000000.00199.899%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000001250.072
250000250000005851.681
1000000100000000110.126
30000003000000001103.793
300000030000000039013.45


Lucas-Lehmer results:
No L-L results for M29881


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-21T19:40:05Oliver KruseOllaptop5F0DA2AD66B4A0__?
2017-09-21T20:27:21Oliver KruseManual testing5F0DA2AD66B4A0__?
2017-10-02T10:30:00kkmrkkblmbrbkManual testing
179287
651457504170017
83357134187028156701162207
5F0DA2AD66B4A0__no
2017-10-03T15:07:51Oliver KruseGTX-1
179287
651457504170017
83357134187028156701162207
13176000677894290663100195118072871
C8B4B4C734BF2225no
2017-10-04T13:31:32kkmrkkblmbrbkManual testing
179287
651457504170017
83357134187028156701162207
13176000677894290663100195118072871
C8B4B4C734BF22__no
2017-10-09T01:00:46Chang Chia-TchehomuraC8B4B4C734BF22__?
2017-10-13T18:19:51Oliver KruseThreadripperC8B4B4C734BF22__no
2020-04-17T13:47:21Oliver KruseManual testing
179287
651457504170017
83357134187028156701162207
13176000677894290663100195118072871
2C300F104D082E__no


P-1 factor-bounds graph:
B1 = 500000000, B2 = 10000000000 (P-1 stage 2)
B1 = 500000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-04-17T13:47:21+00:00