is 2 72051127 - 1
has 21689551 decimal digits
takes 192.637 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-LD6349DD7A65108__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual275106.201164.0000%605000105875004.45393.4813%110.655065.2533%
Target27453.099363.5135%500000170000005.42344.1179%58.522765.0160%
Difference+1+53.1018+0.4865%+105000-6412500-0.9695-0.6366%+52.1322+0.2373%

Known prime factors:
No known factors for M72051127

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2014-07-22bayanneiMac60500010587500---4.454--3.481%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-19Wojciech FlorekManual testing21264--0.049--
2011-02-07Rob_Deetwopc264265--0.052--
2011-03-25oodairaWin02265266--0.104--
2011-03-26ANONYMOUSHP_Pavilion266267--0.207--
2011-04-08tscv4_computers21270--3.316--
2011-04-14tscv4_computers21270--3.316--
2012-11-18GrunwalderGIMPGWPrime02270271--3.319--
2014-07-08NickOfTimeManual testing271272--6.638--
2014-07-08NickOfTimeManual testing272273--13.28--
2014-07-08NickOfTimeManual testing273274--26.55--
2014-07-13Travis Glenn RussoManual testing274275--53.10--


ECM factoring results:
No ECM results for M72051127


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-07-13ANONYMOUSD6349DD7A65108__192.6


PRP results:
No PRP results for M72051127


P-1 factor-bounds graph:
B1 = 605000, B2 = 10587500 (P-1 stage 2)
B1 = 605000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
275
274
273
272
271
270
267
266
265
264
this exponent TF target: 74
TF double-checked to: 67.8
250
260
270
280
Last modified: 2023-04-26T21:34:10+00:00