is 2 248981 - 1
has 74951 decimal digits
takes 0.001 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L50C5D4AD7B71B01Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual267119.342173.1343%26300000028654401075301,272.209124.1990%1,391.551279.6356%6.5012%
PrimeNet2400.000055.0000%2600700000.000114.1974%0.000161.3888%6.3888%
GPU722440.000059.0909%45001100000.000110.1538%0.000163.2447%4.1538%
Difference+23+119.3421+14.0434%+262995500+2865439997530+1,272.2091+14.0452%+1,391.5512+16.3908%+2.3474%

Known prime factors:
No known factors for M248981

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-11-25T00:00:00ANONYMOUSv4_computers1000004000000---0.003--2.243%
2001-06-09T00:00:00ANONYMOUSv4_computers10000010000000---0.005--2.710%
2002-06-02T00:00:00ANONYMOUSv4_computers327683276800---0.002--1.552%
2002-08-10T00:00:00ANONYMOUSv4_computers655366553600---0.003--2.232%
2003-03-07T00:00:00ANONYMOUSv4_computers13107213107200---0.007--3.040%
2003-11-08T00:00:00ANONYMOUSv4_computers26214426214400---0.014--3.965%
2011-02-07T22:22:00Jocelyn LaroucheManual testing20000002000000---0.016--2.599%
2011-07-24T13:13:00Jocelyn LaroucheManual testing20153982015398---0.016--2.607%
2012-02-26T15:17:00Jocelyn LaroucheManual testing25192472519247---0.020--2.823%
2013-10-13T11:11:00David Campeaui5-2500k256500074385000---0.053--6.365%
2014-12-24T22:32:00thelegendarymudkipi5-4670k10000000250000000---0.188--8.540%
2016-05-13T23:04:28mognutsManual testing278469600---5.22690e-5--0.137%
2021-12-04T21:54:40Seth_TrManual testing120000000120000000---0.976--7.898%
2021-12-05T11:06:39Seth_TrManual testing12000000057783635910---26.54--17.820%
2022-05-28T21:01:07Sid & AndyRocky2630000002865440107530---1,272--24.199%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-11-24T00:00:00ANONYMOUSv4_computers252253--0.002--
2000-04-27T00:00:00ANONYMOUSv4_computers21254--0.010--
2022-03-07T05:45:17LordJuliusManual testing254255--0.010--
2001-02-18T00:00:00ANONYMOUSv4_computers21256--0.039--
2002-04-14T00:00:00ANONYMOUSv4_computers21257--0.077--
2016-02-23T16:28:05Mark RoseManual testing257258--0.077--
2008-12-31T13:00:00Sturle Sundegluck.ifi258259--0.154--
2009-01-24T08:48:00Sturle Sundekraus.ifi259260--0.308--
2013-07-13T21:51:00lycornasteroid260261--0.617--
2015-08-10T06:35:00snme2pm1Manual testing261262--1.234--
2016-01-27T10:59:58Gordon SpenceManual testing262263--3.943--
2016-01-27T10:59:58Gordon SpenceManual testing263264--7.885--
2018-03-12T23:21:48Gordon SpenceManual testing264265--15.01--
2019-12-31T11:18:04Gordon SpenceManual testing265266--30.01--


ECM factoring results:
Total ECM effort:19.152 GHz-days
Estimated T-Level:29.856
DigitsB1CompleteFacMiss
201100064.2170.000%
25500009.2430.010%
302500000.97137.866%
3510000000.08092.334%
4030000000.00599.468%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002941.757
2500002500000058217.39


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-01T06:38:54MadPooManual testing50C5D4AD7B71B01F0.001


PRP results:
No PRP results for M248981


P-1 factor-bounds graph:
B1 = 263000000, B2 = 2865440107530 (P-1 stage 2)
B1 = 120000000, B2 = 57783635910 (P-1 stage 2)
B1 = 263000000 (P-1 stage 1)
B1 = 120000000 (P-1 stage 1)
B1 = 10000000, B2 = 250000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 2565000, B2 = 74385000 (P-1 stage 2)
B1 = 2565000 (P-1 stage 1)
B1 = 2519247 (P-1 stage 1)
B1 = 2015398 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 262144, B2 = 26214400 (P-1 stage 2)
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 = 100000, B2 = 4000000 (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)
B1 = 2784, B2 = 69600 (P-1 stage 2)
B1 = 2784 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-28T21:01:07+00:00