is 2 195197 - 1
has 58761 decimal digits
takes 0.001 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L038415CDAAFB493Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual267152.225373.1343 %13693060082386490886703,002.022424.7091 %3,154.247779.7726 %
Target2440.000059.0909 %36004000000.00028.8296 %0.000262.7030 %
Difference+23+152.2253+14.0434 %+136927000+8238648688670+3,002.0223+15.8795%+3,154.2475+17.0696 %

Known prime factors:
No known factors for M195197

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-05-06ANONYMOUSv4_computers10000010000000--0.00424.423%
2002-06-02ANONYMOUSv4_computers32768327680012--0.00120.241%
2002-07-27ANONYMOUSv4_computers65536655360012--0.00322.852%
2003-02-16ANONYMOUSv4_computers1310721310720030--0.00625.419%
2003-10-08ANONYMOUSv4_computers2621442621440012--0.01127.937%
2006-02-01Jossv4_computers10000001000000--0.00718.019%
2009-02-03axnManual testing500000020000000012--0.10435.309%
2013-10-07alpertronManual testing100000000200000000012--1.36142.000%
2023-01-24JossManual testing100000074759955270--33.1548.082%
2023-04-15JacobZSystem76-21369306008238649088670--3,65363.579%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2023-02-09masserManual testing3000000099000000027--0.648
2023-02-13masserManual testing3000000084000000013037--0.594
2023-02-21masserManual testing3000000099000000065--0.648


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-11-17ANONYMOUSv4_computers2522530.003
2000-04-27ANONYMOUSv4_computers212540.012
2022-03-07LordJuliusManual testing254255
2001-01-28ANONYMOUSv4_computers212560.049
2002-04-28ANONYMOUSv4_computers212570.098
2016-02-23Mark RoseManual testing2572580.098
2008-12-30Sturle Sundenouchcraft.ifi2582590.197
2009-01-24Sturle Sundenouchcraft.ifi2592600.393
2013-08-12lycornasteroid2602610.787
2015-08-25NRManual testing2612621.574
2016-01-01Gordon SpenceManual testing2622635.029
2016-01-01Gordon SpenceManual testing26326410.06
2018-01-04BloodERazorManual testing26426519.14
2019-12-12Gordon SpenceManual testing26526638.28


ECM factoring results:
Total ECM effort:62.531 GHz-days
Estimated T-Level:31.953
DigitsB1CompleteFacMiss
2011000144.4250.000%
255000025.3510.000%
302500003.4663.123%
3510000000.39167.665%
4030000000.03796.363%
45110000000.00399.701%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002751.205
2500002500000058514.11
100000010000000048447.22


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-01MadPooManual testing038415CDAAFB493B0.001


PRP results:
No PRP results for M195197


CERT results:
No CERT results for M195197


P-1 factor-bounds graph:
B1 = 136930600, B2 = 8238649088670 (P-1 stage 2)
B1 = 1000000, B2 = 74759955270 (P-1 stage 2)
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 136930600 (P-1 stage 1)
B1 = 100000000 (P-1 stage 1)
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 262144, B2 = 26214400 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 100000, B2 = 10000000 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 262144 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=31.95 ~= 90-bit
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Last modified: 2024-02-29T14:28:04+00:00