is 2 1255147 - 1
has 377837 decimal digits
takes 0.040 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC01ABF859B197D7Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.673768.6567%42184751560835650.57418.7538%24.247871.4005%2.7437%
PrimeNet2560.007662.5000%5500900000.00052.4384%0.008163.4144%0.9144%
GPU722600.122465.0000%5000320000.00030.8562%0.122765.2997%0.2997%
Difference+7+23.5513+3.6567%+4213475+156051565+0.5738+7.8977%+24.1251+6.1008%+6.1008%

Known prime factors (1 factor, 90.3 bits, 0.00719625% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
125514715491441269718344777704371772890.324617116611429511634004
22 × 3 × 79 × 52583 × 745307 × 16610333
2015-01-2874530716610333224,160,0300.07400.0777

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.239%
2003-12-13T00:00:00eteov4_computers2000002000000---0.014--2.762%
2014-09-29T22:04:00Jocelyn LaroucheManual testing251136251136---0.012--1.372%
2015-01-28T17:01:00mikrMSI4218475156083565122890.3240.5740.0801.1488.754%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-14T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.031--
2022-03-07T17:32:03LordJuliusManual testing258260--0.092--
2009-02-17T00:38:00Sturle Sundegonsha.ifi260261--0.122--
2011-05-09T14:41:00XyzzyManual testing261262--0.245--
2012-10-11T11:56:00dbaughManual testing262263--0.782--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.223 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000325 / 1003.2503.815%
2550000325 / 2801.16131.261%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:19.223 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100012.7310.000%
25500001.34925.941%
302500000.10889.793%
3510000000.00799.295%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028110.78
25000025000000448.441


Lucas-Lehmer results:
No L-L results for M1255147


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T19:20:10Oliver KruseGTX-1
1549144126971834477770437177
CFF8E2E81749F8__no
2017-10-20T22:41:16kkmrkkblmbrbkc4.xlarge
1549144126971834477770437177
CFF8E2E81749F8__no


P-1 factor-bounds graph:
B1 = 4218475, B2 = 156083565 (P-1 stage 2)
B1 = 4218475 (P-1 stage 1)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 251136 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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109
TF factor-bounds graph:
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261
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2100
Last modified: 2022-03-07T17:32:03+00:00