is 2 1228327 - 1
has 369764 decimal digits
takes 0.038 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L4CF6EED2B58E7857double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26724.190668.6567 %300000100000000.03684.1738 %24.227469.9649 %
Target2600.125065.0000 %50001500000.00060.8302 %0.125665.2906 %
Difference+7+24.0655+3.6567 %+295000+9850000+0.0363+3.3435%+24.1018+4.6743 %

Known prime factors (1 factor, 76.5 bits, 0.00622850% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12283271073238520967412774984472476.50643687003581595649
11 × 199 × 1193653 × 16719697
2013-10-0711936531671969712,4590.09070.1080

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-09-22Jossv4_computers10001000--4.45000e-50.039%
2002-12-09Mr. P-1v4_computers2000039500012--0.0022.827%
2016-03-17alpertronManual testing3000001000000012---8.301%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-11-14ANONYMOUSv4_computers212570.016
2003-05-26ANONYMOUSv4_computers212580.031
2022-03-07LordJuliusManual testing258260
2022-04-13LordJuliusManual testing21261
2009-02-15Sturle Sundegolan.ifi2602610.125
2012-09-13AxelssonManual testing2612620.250
2022-04-13LordJuliusManual testing261262
2012-10-18dbaughManual testing2622630.799
2022-04-13LordJuliusManual testing262263
2022-04-13LordJuliusManual testing263264


ECM factoring results:
Total ECM effort:19.068 GHz-days
Estimated T-Level:25.658
DigitsB1CompleteFacMiss
201100014.8080.000%
25500001.62019.795%
302500000.13287.678%
3510000000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
10.038
50000500000028110.62
25000025000000448.414


Lucas-Lehmer results:
No L-L results for M1228327


PRP results:
dateuseridcompidcofactorsres64
2017-09-29Oliver KruseGTX-1
107323852096741277498447
CD43D6C121149DD9
2017-10-19kkmrkkblmbrbkc4.xlarge
107323852096741277498447
CD43D6C121149DD9


CERT results:
No CERT results for M1228327


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 20000, B2 = 395000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 1000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
264
263
262
261
260
258
257
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.66 ~= 69-bit
250
260
270
280
JSON version of this page
Last modified: 2024-02-29T14:28:04+00:00