is 2 1273907 - 1
has 383485 decimal digits
takes 0.040 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L471BED9FFF892650double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26846.789069.1176%25000000128546085360322.947918.4375%369.736974.8116%5.6939%
PrimeNet2560.007562.5000%5500900000.00052.4457%0.008063.4172%0.9172%
GPU722600.120665.0000%5500360000.00030.9306%0.120965.3257%0.3257%
Difference+8+46.6685+4.1176%+24994500+128546049360+322.9475+17.5069%+369.6160+9.4859%+9.4859%

Known prime factors:
No known factors for M1273907

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.193%
2013-10-07T16:33:00David Campeaui5-2500k119500034655000---0.139--5.673%
2016-08-04T05:50:14Bruno Victal5820K-factoring25000006250000012---0.265--6.717%
2016-08-27T10:53:03Bruno VictalManual testing25000006250000012---0.265--6.717%
2018-05-03T11:47:07Jocelyn Larouchelow 4M127390712739070012---0.374--7.052%
2018-10-13T20:38:18Jocelyn Larouchelow 4M127390714012977012---0.406--7.152%
2022-05-14T13:12:14Sid & AndyBarrel_Of_Monkeys25000000128546085360---322.9--18.437%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-27T00:00:00ANONYMOUSv4_computers21256--0.008--
2001-11-04T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-06T00:00:00ANONYMOUSv4_computers21258--0.030--
2003-06-17T00:00:00ANONYMOUSv4_computers21258--0.030--
2016-02-23T16:28:26Mark RoseManual testing258260--0.090--
2009-02-18T06:25:00Sturle Sundeeames.ifi260261--0.121--
2012-09-15T18:40:00AxelssonManual testing261262--0.241--
2012-10-18T21:47:00dbaughManual testing262263--0.771--
2015-04-10T03:41:00omylistManual testing263264--1.541--
2015-04-11T13:43:00monstManual testing264265--2.933--
2015-09-24T15:27:46ramgeisManual testing265266--5.866--
2018-09-12T17:28:14YxinityManual testing266267--11.73--
2020-03-13T22:19:17Gordon SpenceManual testing267268--23.46--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.715 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:20.715 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002519.65
250000350000005011.06


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-01T22:34:10MadPooManual testing471BED9FFF8926500.040


PRP results:
No PRP results for M1273907


P-1 factor-bounds graph:
B1 = 25000000, B2 = 128546085360 (P-1 stage 2)
B1 = 25000000 (P-1 stage 1)
B1 = 1273907, B2 = 140129770 (P-1 stage 2)
B1 = 1273907, B2 = 127390700 (P-1 stage 2)
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 1195000, B2 = 34655000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 1273907 (P-1 stage 1)
B1 = 1195000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-14T13:12:14+00:00