is 2 28449989 - 1
has 8564301 decimal digits
takes 28.292 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF19AAF9457B64339double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27367.235365.7534 %610000333560003.45214.6988 %70.687567.3626 %
Target2708.399064.2857 %200000325000002.82593.9918 %11.224965.7114 %
Difference+3+58.8364+1.4677 %+410000+856000+0.6262+0.7070%+59.4626+1.6512 %

Known prime factors (1 factor, 93.9 bits, 0.00032995% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28449989181210015845042613265298651292993.872318471152739360660676
22 × 72 × 13 × 19 × 79 × 83 × 193 × 1237 × 4202279
2021-03-0612374202279111,957,9610.33180.6166

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2006-05-29ANONYMOUSv4_computers405000405000--0.5841.937%
2021-03-06Architects Cubedrdt16100003335600022993.8723.4526.208%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-08-24Net_Forcev4_computers212560.000
2004-08-06riccardo ubertiv4_computers212610.005
2005-03-06ANONYMOUSv4_computers212681.051
2011-11-06Carsten KossendeyManual testing2682692.101
2017-04-17ramgeisManual testing2692704.203
2021-01-11mikrManual testing2702718.405
2021-03-01Sid & AndyManual testing27127350.43


ECM factoring results:
No ECM results for M28449989


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2006-07-25ANONYMOUSv4_computersF19AAF9457B6433928.29
2012-11-09HaroldF19AAF9457B6433928.29


PRP results:
No PRP results for M28449989


CERT results:
No CERT results for M28449989


P-1 factor-bounds graph:
B1 = 610000, B2 = 33356000 (P-1 stage 2)
B1 = 610000 (P-1 stage 1)
B1 = 405000 (P-1 stage 1)
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105
106
102
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105
106
107
108
TF factor-bounds graph:
273
271
270
269
268
261
256
this exponent TF target: 70
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00