20180112, 21:19  #232 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
1110000110101_{2} Posts 
That's not surprising or uncommon at all?

20180315, 23:21  #233 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2·3·7·229 Posts 
Isn't it nice when things just work...
1033878
Code:
... 1884 140 1210024075...00<140> = 2^6 · 5^2 · 127 · 136765630999<12> · 263151616937453<15> · 9255912103178722959401214503081<31> · 1787590630...19<78> 1885 140 1790835631...00<140> = 2^6 · 5^2 · 127^2 · 6939501952...21<132> 1886 140 2650709943...98<140> = 2 · 127 · 1511 · 218422447 · 4466223823<10> · 6398431107...11<53> · 1106503459...37<64> 
20180316, 00:21  #234 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3×29×83 Posts 
Now that's pretty unlikely what are the odds there? Perhaps 1/10^4, 1/10^5?

20180921, 05:59  #237 
Romulan Interpreter
"name field"
Jun 2011
Thailand
2^{4}·613 Posts 
For the 'happy me' thread...
Some nice and (kind of) rare break of D3 on seq 181428, at index 1028 (close to 160 digits), without doubling of the 5  but doubling the 3, and getting a lucky C154 cofactor which split in two primes, 41*P153, haha, both being 1 (mod 4), so we went from 2^3*3^2*5 to 2^4*3^2*5^2*11^2, then 11^3, then it lost the 5's and all the small primes except a 3. We are struggling now with the C156 (still in ecm phase).

20181019, 03:44  #238 
Romulan Interpreter
"name field"
Jun 2011
Thailand
2^{4}×613 Posts 
Replying to myself again... it seems like nobody talks to me anymore
Mister 45792 (or is is Ms? Or Mrs, better!) gave use heart palpitations, when, after the Tibetan Plateau where it didn't want to raise and it didn't want to fall for what it seemed to us to be a million terms, we were expecting to see the Everest, but actually it got the DD and it went down... Then, it lost the DD exactly at index 1400 (!) and it went through a lot of changes from 2^2 to 2^3 to 2^4, even tapped into 2^9, but then it ended up with 2^3*5 guide. We said "well, that was it". But it still surprised us, when it lost the guide after just 4 steps, in quite an unexpected way. We knew from the past that you can lose the G3 without squaring the 5 (see also my former post about losing D3 in a similar way) but we didn't see it yet, in our reservations, and it was a time when we worked a lot of D3 sequences just because they used to "scary" the people off.. (see our former discussions with Frank, when we joined the aliquot club here on this forum). (by the way, where is Frank? He didn't post for ages, and we didn't see him around too much for more than 6 months, did he win his lottery and forgot about us? ) Now, Mrs. 45792 has a 2^3 with no tail, and we really love this, almost as much as we love the DD. That is because this is like a "second DD", (like the "deputy sheriff" hehe). Because 2^3 with no tail of 3 or 5 can not get a 3 or a 5 attached to it, until it gets rid of the third power of 2. And because of that, 2^3 goes usually down, not as fast as the DD, but yet, we love it more than 2^2, for example (where 3 and 5 can come and go as they please). It could be quite nice to see a 5starter termination, we didn't see one in ages... Last fiddled with by LaurV on 20181019 at 03:50 Reason: spacing (we really hate this now!) 
20181022, 11:23  #239 
Romulan Interpreter
"name field"
Jun 2011
Thailand
2^{4}×613 Posts 
Let's bet if we get a symmetric graph...

20200331, 01:20  #240 
Nov 2011
2^{3}×3×11 Posts 
As far as I can see, there are only four aliquot sequences below 1000000 which never reached 140 digits:
15390 (reserved by yafu@home, last update 31.03.2020), 62820 (Batalov, 27.03.2019), 780576 (Batalov, 11.03.2019), 407232 (johnadam74, 27.04.2019). Among them, only the first one is actively developed. The other three were not continued for almost a year and look abandoned. I think it would be great to reach a threshold of 140 digits for all sequences below 1e6. The last three sequences may either be unreserved, so someone else will be able to pick them up. Or Serge, you can continue with your two sequences till 140 digits. I suspect, that should not take too long. Last fiddled with by Drdmitry on 20200331 at 01:21 
20200331, 17:59  #241 
Oct 2006
Berlin, Germany
1164_{8} Posts 
I'll take the 3 to yafu@home to proceed them a bit, at least to a C139.

20200612, 01:09  #242 
Nov 2011
2^{3}·3·11 Posts 
Finally, all aliquot sequences below 1e6 reach 140 digits at east once.
It looks like the next milestone of 150 digits will take very long time. 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Project ends at 79.3 M  davieddy  Lounge  0  20130109 16:56 
gmpecm records page question  yqiang  GMPECM  6  20070518 12:23 
Running LL test from both ends of the sequence?  MS63  Math  40  20051215 09:23 
is there only one Mersenne prime that ends in 3?  ixfd64  Math  18  20051208 02:40 
Records in January  wblipp  ElevenSmooth  10  20040322 01:26 