is 2 25082471 - 1
has 7550577 decimal digits
takes 21.494 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB36B2409042BA577double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27376.262265.7534 %17500001925149590132.38609.2751 %208.648268.9298 %
Target2709.526664.2857 %180000275000002.07323.7343 %11.599865.6194 %
Difference+3+66.7356+1.4677 %+1570000+1897649590+130.3128+5.5408%+197.0484+3.3104 %

Known prime factors:
No known factors for M25082471

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2004-10-18ANONYMOUSv4_computers370000370000--0.4601.827%
2024-03-03James Heinrich7950X17500001925149590--132.411.614%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-08-12Net_Forcev4_computers212560.000
2001-08-24Mattv4_computers212580.002
2003-11-16markrv4_computers212620.012
2004-03-26Michael Hanschov4_computers212670.596
2015-12-28VictordeHollanderManual testing2672681.192
2017-05-23ramgeisManual testing2682707.150
2021-06-02mikrManual testing2702719.53
2022-08-13Naegi MakotoGPU72_TF27127219.07
2022-12-25Sid & AndyManual testing27227338.13


ECM factoring results:
No ECM results for M25082471


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-03-20ANONYMOUSv4_computersB36B2409042BA57721.49
2010-11-04ANONYMOUSv4_computersB36B2409042BA57724.94


PRP results:
No PRP results for M25082471


CERT results:
No CERT results for M25082471


P-1 factor-bounds graph:
B1 = 1750000, B2 = 1925149590 (P-1 stage 2)
B1 = 1750000 (P-1 stage 1)
B1 = 370000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
109
1010
TF factor-bounds graph:
273
272
271
270
268
267
262
258
256
this exponent TF target: 70
TF double-checked to: 67
250
260
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280
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Last modified: 2024-03-13T02:15:48+00:00