is 2 1277 - 1
has 385 decimal digits
takes 0.000 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as ecm on 2022-05-19, 0.0% done, ETC 2022-05-31
0 primality tests remaining
ResidueStatus
L-L5613A480590E78BAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26846,675.706183.8235%77777777777720389153873447359002,626,423.588841.8491%2,673,099.294890.5932%6.7697%
PrimeNet2400.000172.5000%500100000.00001.7119%0.000172.9708%0.4708%
GPU722440.001875.0000%500100000.00000.6566%0.001875.1642%0.1642%
Difference+24+46,675.7042+8.8235%+777777777277+2038915387344725900+2,626,423.5888+41.1924%+2,673,099.2930+15.4291%+15.4291%

Known prime factors:
No known factors for M1277

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-02-11T00:00:00ANONYMOUSv4_computers100001000000---1.51169e-6--0.172%
2001-02-11T00:00:00ANONYMOUSv4_computers1000000100000000---0.000--2.942%
2001-05-13T00:00:00ANONYMOUSv4_computers30000000004290000000---0.073--9.343%
2002-05-25T00:00:00ANONYMOUSv4_computers10737418244290000000---0.030--9.346%
2002-07-27T00:00:00ANONYMOUSv4_computers21474836484290000000---0.054--9.364%
2002-09-14T00:00:00ANONYMOUSv4_computers32212254724290000000---0.078--9.336%
2002-12-25T00:00:00ANONYMOUSv4_computers42900000002147483647---0.101--9.298%
2003-09-29T00:00:00ANONYMOUSv4_computers1000000100000000---0.000--2.942%
2003-11-28T00:00:00ANONYMOUSv4_computers1000000100000000---0.000--2.942%
2008-10-22T11:10:00Markus TervoorenManual testing450000000004500000000000---6.803--21.098%
2012-08-14T02:14:00Jocelyn LaroucheManual testing500000000002147483647---1.182--13.186%
2012-08-16T22:54:00Jocelyn LaroucheManual testing1500000000002147483647---3.546--14.998%
2012-08-17T16:46:00Jocelyn LaroucheManual testing2000000000002147483647---4.729--15.476%
2012-08-19T13:00:00Jocelyn LaroucheManual testing3100000000002147483647---7.329--16.208%
2012-08-21T10:48:00Jocelyn LaroucheManual testing5000000000002147483647---11.82--17.008%
2012-08-28T10:49:00Jocelyn LaroucheManual testing10000000000002147483647---23.64--18.172%
2012-09-05T10:39:00Jocelyn LaroucheManual testing15000000000002147483647---35.46--18.853%
2012-09-14T13:42:00Jocelyn LaroucheManual testing20000000000002147483647---47.29--19.336%
2012-09-15T01:39:00Jocelyn LaroucheManual testing20000000000003000000000000---48.57--20.174%
2012-09-15T12:42:00Jocelyn LaroucheManual testing20000000000004500000000000---50.51--20.999%
2012-09-18T11:39:00Jocelyn LaroucheManual testing200000000000010000000000000---57.59--22.592%
2012-09-22T05:03:00Jocelyn LaroucheManual testing200000000000020000000000000---70.47--23.939%
2012-09-25T16:14:00Jocelyn LaroucheManual testing200000000000030000000000000---83.35--24.713%
2016-02-29T00:01:41James Hintz08_04_2014240474376566019237950125280012---301.6--28.134%
2016-05-15T10:55:08NoPolarBearsHereManual testing714879390545037401601512---0.740--16.876%
2016-08-06T10:53:22NoPolarBearsHereManual testing87239082440671740934788012---10.60--21.915%
2016-08-28T05:23:54James Hintz04_29_2016435691310742334855304859384012---546.4--29.210%
2016-10-31T00:06:46Bruno VictalManual testing10000001003192986061516---1,292--14.618%
2016-12-17T00:42:36kanaanManual testing100000020000006---2.49312e-5--1.092%
2016-12-17T00:42:36kanaanManual testing10000001000000012---3.52363e-5--1.809%
2017-01-25T13:30:22ANONYMOUSManual testing30100000000012---0.001--0.000%
2017-03-13T15:10:44James Hintz11_04_2016500000000000340000000000024112---627.0--29.458%
2019-09-21T12:56:09storm5510Manual testing24544834829196358678632012---3.078--19.583%
2020-11-10T23:37:37KuyiytereaManual testing100100000000000012---1.288--0.045%
2020-11-11T18:51:32KuyiytereaManual testing30100000000012---0.001--0.000%
2020-11-11T18:51:32KuyiytereaManual testing301000000000012---0.013--0.000%
2020-11-11T18:51:32KuyiytereaManual testing3010000000000012---0.129--0.001%
2021-02-09T20:24:52Martin ChristensenMy_New_Machine1000000080000000012---0.001--5.698%
2021-06-29T17:53:43DKZWaaaf10000000001000000000---0.024--7.175%
2021-08-07T16:43:04H Michaelson100000010000000012---0.000--2.942%
2021-10-18T15:24:40Mirel Alin Ciorneiamd5900hs500000000050000000000012---0.756--16.913%
2021-12-10T22:12:06George Woltmanx64-debug5000011379177810---0.015--2.496%
2022-01-11T06:17:49LordJuliusWhiteBox_v3085000000011360092488394650---14,633--24.194%
2022-02-05T23:25:43Jocelyn LaroucheManual testing10000000001000000000---0.024--7.175%
2022-03-03T13:55:42-Anonymous-1000000120244504380---0.155--7.318%
2022-03-11T00:50:15Cong ShengzhuoThis-Laptop100000000172133725043280---221.7--20.843%
2022-03-27T21:23:52-Anonymous-10000001210565215860---1.559--9.054%
2022-03-28T23:39:56-Anonymous-10000001159224246180---1.493--9.020%
2022-04-03T08:09:07DobriManual testing10000001000000---2.36431e-5--0.800%
2022-04-10T04:22:21404_factor_not_foundManual testing5000000000776318227752107040---1,000,006--35.544%
2022-04-10T12:54:21-Anonymous-10000001167373517310---1.504--9.025%
2022-04-25T19:18:46-Anonymous-1000000639361793070---0.824--8.561%
2022-04-27T07:19:21DobriManual testing100000000000100000000000---2.364--14.326%
2022-04-27T07:32:25DobriManual testing76543210110396119663830---142.2--19.981%
2022-04-27T07:32:25DobriManual testing100000000001588945946788200---2,047--28.808%
2022-04-30T20:00:36Jorge CoveiroManual testing10000000000110222963350500---142.2--25.190%
2022-04-30T21:51:20-Anonymous-10000001327302006030---1.710--9.126%
2022-05-07T05:01:43DobriManual testing127912791279127912791279---3.024--14.733%
2022-05-07T06:26:04-Anonymous-1000000327544657440---0.422--8.054%
2022-05-11T07:39:55ANONYMOUSHarry_s_Mac_OS_X100000001000000000---0.002--5.888%
2022-05-17T05:14:47ViliamF3100000000000100000000000---2.364--14.326%
2022-05-19T17:25:36ViliamF3500000000000500000000000---11.82--17.008%
2022-05-23T01:58:00DobriManual testing7777777777772038915387344735900---2,626,424--41.849%
2022-05-25T13:33:20-Anonymous-10000005741447651940---7.396--10.291%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-05-08T05:15:38GURA LOVE1000000000070000000000027--1.230
2021-05-25T02:55:25ViliamF31000000000001000000000000027--16.09
2021-05-30T00:37:18ViliamF31000000000001000000000000065--16.09
2021-06-13T07:53:23ViliamF31000000000000100000000000027--35.94
2021-06-28T22:12:49ViliamF31000000000000100000000000065--35.94


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2022-04-30T14:41:09DobriManual testing21239--5.73512e-5--
2022-04-30T14:48:13DobriManual testing239240--5.73512e-5--
2021-09-08T22:19:10John BurroughsManual testing21251--0.235--
2021-09-08T22:19:10John BurroughsManual testing251252--0.235--
1998-07-29T00:00:00ANONYMOUSv4_computers251253--0.705--
2021-09-08T22:19:10John BurroughsManual testing252253--0.470--
1999-12-08T00:00:00ANONYMOUSv4_computers253254--0.940--
2021-09-08T22:19:10John BurroughsManual testing253254--0.940--
2000-01-12T00:00:00ANONYMOUSv4_computers254255--1.879--
2021-09-08T22:19:10John BurroughsManual testing254255--1.879--
2000-07-12T00:00:00ANONYMOUSv4_computers21256--7.517--
2021-09-08T22:19:10John BurroughsManual testing255256--3.759--
2002-08-17T00:00:00Alex Kruppav4_computers21257--15.03--
2002-08-24T00:00:00Alex Kruppav4_computers21257--15.03--
2021-09-08T22:19:10John BurroughsManual testing256257--7.517--
2021-09-08T22:19:10John BurroughsManual testing257258--15.03--
2021-09-08T22:19:10John BurroughsManual testing258259--30.07--
2010-12-10T19:19:00monstManual testing258260--90.21--
2021-09-08T22:19:10John BurroughsManual testing259260--60.14--
2014-02-28T21:47:00Sid & AndyManual testing260261--120.3--
2021-09-08T22:19:10John BurroughsManual testing260261--120.3--
2015-06-16T22:06:00snme2pm1G1261262--240.5--
2016-02-15T08:06:50snme2pm1G1262263--768.7--
2017-03-22T15:27:10Ducho_YYZManual testing263264--1,537--
2017-08-15T04:14:08Ducho_YYZManual testing264265--2,926--
2018-05-29T04:45:19Andriy MakukhaManual testing265266--5,852--
2018-06-03T15:38:54Andriy MakukhaManual testing266267--11,704--
2020-12-17T09:15:45Ruslan BorisovManual testing267268--23,407--


ECM factoring results:

Old Calculation Method

Total ECM effort:9,173,060.929 GHz-days
Estimated T-Level:62.878
DigitsB1CurvesCompleteFacMiss
2011000736306 / 1007,363.0600.000%
2550000693781 / 2802,477.7890.000%
30250000377177 / 640589.3390.000%
351000000257011 / 1580162.6650.000%
403000000240893 / 470051.2540.000%
4511000000238029 / 970024.5390.000%
5044000000235218 / 1710013.7550.000%
55110000000229677 / 465004.9390.716%
60260000000227157 / 1120002.02813.157%
65800000000207194 / 3600000.57656.240%

New Calculation Method

Total ECM effort:9,173,060.929 GHz-days
Estimated T-Level:62.878
DigitsB1CompleteFacMiss
2011000140,735.6830.000%
255000075,347.2050.000%
3025000033,065.1170.000%
35100000011,354.1620.000%
4030000003,589.6180.000%
4511000000987.6310.000%
5044000000243.3040.000%
5511000000055.0020.000%
6026000000011.4450.001%


ECM Summary

B1B2factorcurvesGHz-days
12012010,1000.000
12080001,300,0000.047
8008001502.76790e-5
10001000001003.40218e-5
100010000001,2000.002
200020000001,0000.003
300030000001,0000.004
400040000001,0000.005
500050000015,0000.026
500050000001,0000.007
600060000001,0000.008
700070000001,0000.009
800080001500.000
800080000001,0000.011
900090000001,0000.012
10000100001,0000.002
10000500001,0000.002
10000100000367,9980.885
1000010000002000.001
10000100000002000.003
11000110000011,6200.043
20000200000002000.005
2500010000003000.002
30000300000002000.008
3333398434710,0000.087
34543998434710,0000.190
40000400000002000.011
500005000013,5010.156
50000100000030,3000.381
50000500000069,1671.177
50000110000001,0000.024
500001275000050,0001.279
50000500000006700.045
5000010000000001000.112
60000600000003000.024
70000700000003000.028
80000800000016,8000.457
80000800000003000.032
90000900000003000.036
10000010000001000.002
2500002500000012,3171.048
50000050000010,0001.153
50000050000001000.012
500000150000005000.066
10000001000000137,10231.62
100000020000001000.023
100000010000000107,00625.75
1000000500000001000.028
10000001000000005,8761.999
1000000100000000010,03413.41
1000000100000000000101.109
3000000300000010,0006.920
100000001000.230
100000001000000001,0012.409
100000002000000001,0002.517
100000002500000001000.257
5000000050000000000151.002
5100000051000000000151.022
5200000052000000000151.042
5300000053000000000151.062
5400000054000000000151.082
54875487948794874876.186
5500000055000000000151.102
5600000056000000000151.122
5700000057000000000151.142
5800000058000000000151.163
5900000059000000000151.183
6000000060000000000151.203
6100000061000000000151.223
6200000062000000000151.243
6300000063000000000151.263
6400000064000000000151.283
6500000065000000000151.303
6600000066000000000151.323
6700000067000000000151.343
6800000068000000000151.363
6900000069000000000151.383
7000000070000000000151.403
7100000071000000000151.423
7200000072000000000151.443
7300000073000000000151.463
7400000074000000000151.483
7500000075000000000151.503
7600000076000000000151.523
7700000077000000000151.543
7800000078000000000151.563
7900000079000000000151.583
8000000080000000000151.603
8100000081000000000151.623
8200000082000000000151.644
8300000083000000000151.664
8400000084000000000151.684
8500000085000000000151.704
8600000086000000000151.724
8700000087000000000151.744
8800000088000000000151.764
8900000089000000000151.784
9000000090000000000151.804
9100000091000000000151.824
9200000092000000000151.844
9300000093000000000151.864
9400000094000000000151.884
9500000095000000000151.904
9600000096000000000151.924
9700000097000000000151.944
9800000098000000000151.964
9900000099000000000151.984
10000000010000000001002.406
100000000100000000000152.004
101000000101000000000152.024
102000000102000000000152.044
103000000103000000000152.064
104000000104000000000152.084
105000000105000000000152.105
106000000106000000000152.125
107000000107000000000152.145
108000000108000000000152.165
109000000109000000000152.185
110000000110000000002,19582.15
110000000110000000000152.205
111000000111000000000152.225
112000000112000000000152.245
113000000113000000000152.265
114000000114000000000152.285
260000000260000000002,768244.8
260000000317855988451614,93953,441
30000000030000000000101.021
8000000008000000002,112389.7
80000000080000000002,000385.0
8000000008000000000043,64711,880
8000000008000000000001010.69
800000000129964630095482093,044
800000000158925826059161,70630,318
8000000002224937144431620496.1
800000000259925737671783239,350
800000000389886727830781596,890
800000000500000000000005277.6
800000000519847717989781056,060
850000000850000000203.921
85000000085000000000612177.0
8500000001489938239791895,0841,586,347
85000000015892628251516801,423
9000000001,500309.9
900000000900000000408.304
9000000009000000000015045.93
9000000001589267960281640711.8
95000000095000000018440.32
950000000190711253733168170.6
950000000259927029262081353,913
9500000005254980905791214817.2
999999999999999990017542.11
999999999999999999008,5142,897
1000000000100000000023453.97
10000000001000000000006221.09
1000000000190711767246167,037150,133
1000000000259927616348581574,552
11000000001100000000102.537
11000000002599286731042810290.2
120000000012000000006818.82
12000000002542816526251610284.2
12000000002599296124426828813.1
1200000000389890720018985217.1
12345678901234567890360102.5
1234567890500000000000008444.9
1234567890666000000000002,215163,881
14000000001400000000175.490
1400000000105099733765962151,749
150000000015000000002,9671,027
15000000003898936554514825911,264
1500000000105099826286082637,349
1600000000160000000010338.01
160000000038989459478988693,003
160000000051985570236618352,026
1600000000105099918806202141,633
1700000000170000000017367.84
1700000000389895651545581285,573
170000000051985664170458181,043
1700000000100000000000000212,332
17000000001051000344563524466.8
1800000000180000000016468.09
18000000002000000000000016360.7
180000000051985758104298181,043
180000000080000000000000302,668
180000000085000000000000151,417
1800000000100000000000000262,888
1800000000105100126976472151,751
1800000000157649589083922152,623
1800000000200000000000000296,431
1900000000519858637798684231.9
200000000020000000007132.75
2000000000200000000000200136.1
2000000000519859694554385289.9
200000000085000000000000151,418
2000000000100000000000000293,223
2000000000105100335146742222,569
2100000000519860633892782116.0
2200000000649822798224782144.8
2300000000649823620145882144.9
2400000000649824676901582144.9
25000000002500000000137.496
250000000050000000000001,0716,541
25000000002000000000000044310,059
2500000000779786606398982173.7
290000000029000000009362.21
2900000000290000000000160157.9
290000000070000000000000201,563
2900000000826409651067161,988183,137
290000000090975170616348414,155
290000000010510123721791235,7624,183,325
360000000036000000003125.74
3600000000105101931118812101,171
3600000000157651393226262111,928
3600000000210200832203682102,334
4000000000400000000000400544.3
450000000045000000009194.45
45000000007000000000000011863.5
4500000000105102833189982111,291
45000000001559572743128581173.6
45000000001576522952974325877.5
4500000000194945583102288102,168
4500000000210201734274852327,477
4500000000315300658489752113,850
4500000000420399559574622104,663
600000000060000000006083.04
76000000004200000000000005,6762,648,087
80000000008000000000001335.38
9999999990099999999900003102.1
1000000000000100000000000000011,336
various1,641697.5440