is 2 27820783 - 1
has 8374891 decimal digits
takes 25.754 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2692.142563.2353%285000344967002.88446.8298%5.026965.7463%2.5110%
PrimeNet2660.530862.1212%13000045000000.49415.2882%1.024964.1243%2.0031%
GPU722708.588964.2857%20000060000000.69263.9167%9.281565.6845%1.3988%
Difference-1-6.4465-1.0504%+85000+28496700+2.1918+2.9131%-4.2546+0.0617%+0.0617%

Known prime factors (4 factors, 204.3 bits, 0.00073444% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
278207831602477100811237.2222880
26 × 32 × 5
-64641.068e-98.590e-50.0002
278207835310987474711238.9509545
5 × 23 × 83
2008-09-0823831.403e-93.526e-56.283e-5
2782078396724900619691693111963.069173835690785
5 × 29 × 113 × 2971 × 3571
2016-12-07297135710.12070.00400.0081
27820783391835385286814770872065.087704213438721
3 × 13 × 24971 × 723109
2018-05-29249717231090.32630.08460.0988

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
27820783851073581091150399551512376.172
27820783154999438321178916770953052419131100.290
27820783513704735683752099289043206248131102.019
27820783627907232209184264343242041404731102.308
278207832081032823406440269002388569697732104.037
2782078337900238701145763359719091319387007705739128.155
2782078382320007551086641709145721934728216557096142139.240
27820783333480744554280111055338414613425291412513743141.259
278207836073426463381902289389697459349892985461126571161750165.377
2782078320128769303030434812944974214132708612007895387284
7
51167.106
2782078332255891875593535526241756936723591025162931353045
758194070607
62204.327
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-05-21T03:33:29masserManual testing28500034496700-
skipped known factor: 160247710081
skipped known factor: 531098747471
skipped known factor: 9672490061969169311
skipped known factor: 39183538528681477087
--2.884--6.830%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-08T23:37:00Will EdgingtonManual testing??38.950128.68944e-1153.031.78914e-10
2016-12-07T17:19:50TJAOIManual testing263264*63.069190.06352.900.130
2022-04-07T12:00:38James HeinrichManual testing264265--0.134--
2022-08-10T19:29:00LordJuliusManual testing2126537.222121.06837e-953.032.19976e-9
2022-08-10T19:29:00LordJuliusManual testing2126538.950121.40313e-953.032.88902e-9
2022-08-10T19:29:00LordJuliusManual testing2126563.069190.12152.900.248
2018-05-29T13:25:07TJAOIManual testing265266*65.087200.06452.500.130
2022-08-10T19:29:00LordJuliusManual testing26526665.087200.06452.500.130
2022-08-10T19:29:00LordJuliusManual testing266267--0.537--
2022-08-10T19:29:00LordJuliusManual testing267268--1.074--
2022-08-05T12:41:57masserManual testing267269--3.223--


ECM factoring results:
No ECM results for M27820783


Lucas-Lehmer results:
No L-L results for M27820783


PRP results:
No PRP results for M27820783


P-1 factor-bounds graph:
B1 = 285000, B2 = 34496700 (P-1 stage 2)
B1 = 285000 (P-1 stage 1)
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TF factor-bounds graph:
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264
2
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Last modified: 2022-08-10T19:29:00+00:00