is 2 1747063 - 1
has 525919 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L45E2F23A3ED8CB85double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.007968.6567%2475400866600000.55557.9499%17.563471.1485%2.4918%
PrimeNet2570.011063.1579%80001400000.00122.8016%0.012264.1901%1.0322%
GPU722610.175865.5738%80001100000.00111.4122%0.176966.0599%0.4862%
Difference+6+16.8321+3.0829%+2467400+86550000+0.5544+6.5377%+17.3865+5.0886%+5.0886%

Known prime factors (2 factors, 170.4 bits, 0.00975598% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17470635670797471215638139877772478.908162295162544671776
25 × 32 × 83 × 6789456264419
2020-07-0683678945626441944,41429,09854,347
174706335881056311602743544922398812891.5351026896463138499972380
22 × 33 × 5 × 468463 × 543877 × 7463747
2015-04-225438777463747376,514,6060.07240.0871

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
174706320347420339638275029109104858695827869023074859345
37
52170.443
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-09T06:18:00Carsten Kossendeyleela950001543750---0.014--2.401%
2014-04-05T13:21:00Jocelyn LaroucheManual testing100000100000---0.008--0.887%
2014-05-06T10:53:00Jocelyn LaroucheManual testing136738136738---0.011--1.059%
2014-09-15T22:12:00ANONYMOUSManual testing173476173476---0.014--1.203%
2015-04-22T11:19:00mikrMSI247540086660000122891.5350.5560.1901.1117.950%
2016-03-16T12:35:09alpertronManual testing5000001500000012---0.101--5.040%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-20T22:46:00Architects Cubedm1_fw260261--0.088--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.914--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.454 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:17.454 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
50000500000018512.71
500005000000694.742


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers45E2F23A3ED8CB850.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T05:41:51Oliver KruseGTX-3
3588105631160274354492239881
0FA0C6A27E0A53__no
2017-11-03T18:06:42kkmrkkblmbrbkc4.xlarge
3588105631160274354492239881
0FA0C6A27E0A53__no
2020-07-06T13:39:35mrh.orgw
567079747121563813987777
3588105631160274354492239881
2AB874439BCCCDA8no
2020-07-07T12:17:37marssystemsSYSTEM01
567079747121563813987777
3588105631160274354492239881
2AB874439BCCCDA8no


P-1 factor-bounds graph:
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 173476 (P-1 stage 1)
B1 = 136738 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-07-07T12:17:37+00:00