Of the ~124 million known factors, only 10 of them match the pattern of multiple 6 plus multiple 3 ending for both exponent and factor (yours has many in the exponent but only a single 6 at the end of the factor. And only one of them is in GIMPS range:[code] M287956633 has a factor: 188288997950876633
M1267676633 has a factor: 1508159960986633
M1394486633 has a factor: 8003940505376633
M1614086633 has a factor: 266921028729566633
M2599036633 has a factor: 77201784146633
M3149666633 has a factor: 45763723876166633
M3686626633 has a factor: 3206273929226633
M3863026633 has a factor: 81817760631056633
M4088396633 has a factor: 4589101358478106633
M4246166633 has a factor: 168589799996633[/code]If you cared to know :mooc:

[B][/B][QUOTE=petrw1;479978]56663333 Factored 117668043758277867795710633[/QUOTE]

Similarly:
54297751 Factored 413618853521086092885751

There are 27 factors that match the last 7 digits of the exponent and factor, and none that match more than that:[code]M29999999 has a factor: 59999999
M32548409 has a factor: 68596162548409
M304382063 has a factor: 89449974382063
M389999999 has a factor: 779999999
M517868633 has a factor: 1164015397868633
M892082951 has a factor: 4861852082951
M1229999999 has a factor: 2459999999
M1236290281 has a factor: 4796806290281
M1254617737 has a factor: 411514617737
M1340466791 has a factor: 6020961280466791
M1426591919 has a factor: 5601259236591919
M1454117647 has a factor: 26174117647
M1496367713 has a factor: 335186367713
M1908028169 has a factor: 137378028169
M1960041841 has a factor: 470410041841
M2044060871 has a factor: 68469845674060871
M2233922231 has a factor: 460925173922231
M2291942959 has a factor: 1288071942959
M2853650119 has a factor: 16986415113650119
M3001111111 has a factor: 30011111111
M3065961401 has a factor: 4292345961401
M3287142857 has a factor: 26297142857
M3346923431 has a factor: 16251087126923431
M3420891679 has a factor: 21572423440891679
M3474253703 has a factor: 9151184253703
M3496569617 has a factor: 993193606569617
M3863902439 has a factor: 162283902439[/code]

I got bored and decided to rerun P-1 on exponents with only stage 1 done:

[QUOTE][Sun Feb 18 10:47:26 2018]
P-1 found a factor in stage #2, B1=800000, B2=12500000, E=12.
UID: ixfd64/dchia-pro, M47501749 has a factor: 793528449260403299636240009 (P-1, B1=800000, B2=12500000, E=12)[/QUOTE]

I'm glad the effort turned out to be worthwhile!

Nothing spectacular, but a nice result.

[url]http://www.mersenne.ca/exponent/52660711[/url]

52660711 has a factor 90657772754508534123079
76.3 bits, found via P-1 (stage 2?)
This was marked as poorly P-1'ed before by Mersenne.ca. (b1=855,000,b2=)

I spent 1.1 GHz/days. 1 bad LL and 2 more spent 100 GHz/days [B][U]each[/U][/B]. The bad LL was done by the user that did the initial P-1 back in 2011. And over 33 GHz/days of additional T-F was done after the initial P-1.

:picard:

[QUOTE=ixfd64;480383]I got bored and decided to rerun P-1 on exponents with only stage 1 done:



I'm glad the effort turned out to be worthwhile![/QUOTE]

I'm doing lots of these in the 50-59M range.

[QUOTE=GP2;479455]What are the criteria for noteworthiness?[/QUOTE]

Finding the first factor of a Mersenne number is the general man's successs (German: "der Erfolg des kleinen/gemeinen Mannes", maybe knows how to translate this a bit better). So I wouldn't put too many restrictions on that. While I feel that every factor about 100 bit is somewhat noteworthy, that doesn't mean everybody should post those factors, and it doesn't mean that this is a requirement, either.

P-1 found a factor in stage #2, B1=685000, B2=12501250.
UID: Jwb52z/Clay, M86261069 has a factor: 108347656269103560321473 (P-1, B1=685000, B2=12501250)

76.520 bits.

Another one under 1M:

lycorn/asteroid, M[B]292717[/B] has a factor: [B]3767709660056805735113918599207[/B] (ECM curve 86, B1=350000, B2=25000000)

101.57 bits

k = 3[SUP]2[/SUP] × 293 × 94302613 × 25880080988239

Definitely not suitable for TF or P-1...

I didn't report here, but

ET_/Pentium_G2030, M2493949 has a factor: 8999652246905381346333863 (ECM curve 137, B1=50000, B2=5000000)

82.896 bits

k = 11 × 101 × 1624030217121929

M2504969 - 88 bits
 

ECM found a factor in curve #1, stage #2

Sigma=394033186513377, B1=50000, B2=5000000.

M2504969 has a factor: 312774689772122552706712063

ECM curve 1, B1=50000, B2=5000000