is 2 25061521 - 1
has 7544270 decimal digits
takes 21.476 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L24ED96911E283677double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27119.076264.7887%3700003700000.45981.6203%19.535965.3593%0.5705%
PrimeNet2660.589362.1212%11000040000000.40004.9792%0.989364.0073%1.8860%
GPU722709.534664.2857%18000050000000.55003.6615%10.084565.5934%1.3077%
Difference+1+9.5416+0.5030%+190000-4630000-0.0902-2.0412%+9.4514-0.2341%-0.2341%

Known prime factors:
No known factors for M25061521

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-07-26T00:00:00Duane Bongv4_computers370000370000---0.460--1.620%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-08-24T00:00:00Mattv4_computers21258--0.002--
2003-11-28T00:00:00markrv4_computers21262--0.025--
2004-04-09T00:00:00Helgenv4_computers21267--1.186--
2015-12-28T01:29:24VictordeHollanderManual testing267268--1.193--
2017-05-15T00:51:50ramgeisManual testing268269--2.385--
2017-05-15T00:51:50ramgeisManual testing269270--4.771--
2021-06-01T18:55:44mikrManual testing270271--9.54--


ECM factoring results:
No ECM results for M25061521


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-08-20T00:00:00Duane Bongv4_computers24ED96911E28367721.48
2011-03-01T16:56:00mes4646Number3a24ED96911E28367721.48


PRP results:
No PRP results for M25061521


P-1 factor-bounds graph:
B1 = 370000 (P-1 stage 1)
104
105
106
104
105
106
TF factor-bounds graph:
271
270
269
268
267
262
258
256
250
260
270
280
290
2100
Last modified: 2021-06-01T18:55:44+00:00