is 2 72215551 - 1
has 21739048 decimal digits
takes 193.076 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L5D2F2F3FFC0115__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual275105.959364.0000%830000226175007.81954.2109%113.778865.5159%
Target27452.978463.5135%50000013600000030.55804.1190%83.536565.0164%
Difference+1+52.9809+0.4865%+330000-113382500-22.7385+0.0918%+30.2424+0.4995%

Known prime factors:
No known factors for M72215551

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-08-16SyntonyHellhound83000022617500---7.820--4.211%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-19Wojciech FlorekManual testing21264--0.049--
2010-07-10tmorrowpaperclip264265--0.052--
2010-07-12tmorrowpaperclip265266--0.103--
2010-09-18chargerSLSL.1800.1266267--0.207--
2010-09-22chargerSLSL.1800.1267268--0.414--
2010-09-23eon_blue_apocalypse6pack-2268269--0.828--
2012-11-28pal1pal1_Athlon1.4G269270--1.656--
2013-04-19frmargnu033270271--3.311--
2015-02-10RichD0Manual testing271272--6.623--
2015-07-04James HeinrichManual testing272274--39.74--
2015-07-05RichD0Manual testing274275--52.98--


ECM factoring results:
No ECM results for M72215551


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-12-06arnaudsrv-6405D2F2F3FFC0115__193.1


PRP results:
No PRP results for M72215551


P-1 factor-bounds graph:
B1 = 830000, B2 = 22617500 (P-1 stage 2)
B1 = 830000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
275
274
272
271
270
269
268
267
266
265
264
this exponent TF target: 74
TF double-checked to: 67.9
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00