is 2 193883 - 1
has 58365 decimal digits
takes 0.001 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as ECM on 2024-03-14, 0.0% done, ETC 2024-04-09
0 primality tests remaining
ResidueStatus
L-LFC5F6D39105359E2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual267153.257073.1343 %13798671488723910074803,232.887224.8090 %3,386.144279.7994 %
Target2440.000059.0909 %36004000000.00028.8197 %0.000262.6990 %
Difference+23+153.2569+14.0434 %+137983114+8872390607480+3,232.8870+15.9892%+3,386.1440+17.1004 %

Known prime factors:
No known factors for M193883

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-05-06ANONYMOUSv4_computers10000010000000--0.00424.409%
2002-06-02ANONYMOUSv4_computers32768327680012--0.00120.228%
2002-07-27ANONYMOUSv4_computers65536655360012--0.00322.838%
2003-02-16ANONYMOUSv4_computers1310721310720030--0.00625.406%
2003-10-08ANONYMOUSv4_computers2621442621440012--0.01127.923%
2006-02-01Jossv4_computers10000001000000--0.00718.008%
2009-02-03axnManual testing500000020000000012--0.10435.295%
2013-10-17alpertronManual testing100000000200000000012--1.36141.988%
2023-01-24JossManual testing100000074759955270--33.1548.066%
2023-04-12JacobZSystem76-21379867148872391007480--3,93463.724%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-07-11ATHec2-P_150000000705000000027--2.581
2023-02-25masserManual testing3000000084000000065--0.594
2023-09-02masserManual testing30000000237000000019067--1.140


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_computers212560.050
2002-04-28ANONYMOUSv4_computers212570.099
2016-02-23Mark RoseManual testing2572580.099
2008-12-31Sturle Sundenardi.ifi2582590.198
2009-01-26Sturle Sundedietrich.ifi2592600.396
2013-08-06lycornasteroid2602610.792
2015-08-25NRManual testing2612621.584
2015-12-28Gordon SpenceManual testing2622635.063
2015-12-28Gordon SpenceManual testing26326410.13
2018-01-05BloodERazorManual testing26426519.27
2019-12-12Gordon SpenceManual testing26526638.54


ECM factoring results:
Total ECM effort:162.015 GHz-days
Estimated T-Level:31.657
DigitsB1CompleteFacMiss
2011000120.3590.000%
255000021.5760.000%
302500002.9535.216%
3510000000.33171.793%
4030000000.03196.909%
45110000000.00399.746%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002751.205
2500002500000058514.10
100000010000000020920.39
100000014160948270.776
1000000266204620588.969
10000003136507584810.45
100000032431756505067.43
166434829143029103738.70


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-01MadPooManual testingFC5F6D39105359E20.001


PRP results:
No PRP results for M193883


CERT results:
No CERT results for M193883


P-1 factor-bounds graph:
B1 = 137986714, B2 = 8872391007480 (P-1 stage 2)
B1 = 1000000, B2 = 74759955270 (P-1 stage 2)
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 137986714 (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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260
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this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=31.66 ~= 89-bit
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Last modified: 2024-03-19T06:25:06+00:00