20141126, 04:48  #23 
Nov 2011
Saint Maur, France
50_{10} Posts 
Yes, powers of 3, you're right, sorry for the mistake.

20141126, 04:56  #24 
"Ed Hall"
Dec 2009
Adirondack Mtns
3214_{10} Posts 

20141126, 16:40  #25 
Nov 2011
Saint Maur, France
2×5^{2} Posts 
LOL

20141129, 10:30  #26 
Nov 2011
Saint Maur, France
2×5^{2} Posts 
Jamais 2 sans 3 ?

20141130, 03:37  #27 
"Ed Hall"
Dec 2009
Adirondack Mtns
2·1,607 Posts 

20141130, 14:14  #28 
Nov 2011
Saint Maur, France
2×5^{2} Posts 
Ah, in french we say "jamais deux sans trois", to mean that something that occured twice, can happen another time.
I was trying to anticipate your 3rd announcement of a 4sociable group. 
20141130, 15:57  #29  
"Ed Hall"
Dec 2009
Adirondack Mtns
C8E_{16} Posts 
Quote:
The second one was quite a surprise. I had not expected another so soon. I would really be surprised to find a third in the near future  delighted, but surprised. Merci, pour vos pensees aimables. 

20141208, 12:49  #32 
Nov 2011
233 Posts 
I revised my old program for searching aliquot cycles and rewrote it. So now it can search for all cycles inside any given interval. On my laptop (one core of Intel i53230M) it takes about 34  34.3 secs to go through 10^7 numbers of size around 10^14. EdH, May I ask you how it compares with your program's speed?
If someone is interested in doing a full search of aliquot cycles up to 10^14 (or maybe even up to 10^15?) I can try to make a usable version of my program and publish it here. Last fiddled with by Drdmitry on 20141208 at 12:50 
20141208, 15:04  #33 
Nov 2011
351_{8} Posts 
Sorry, I made a stupid mistake when counted the range of numbers. It is actually much slower: about 26  26.3 secs per 10^6 numbers of size around 10^14.

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Carmichael numbers and Devaraj numbers  devarajkandadai  Number Theory Discussion Group  0  20170709 05:07 
6 digit numbers and the mersenne numbers  henryzz  Math  2  20080429 02:05 
LLT numbers, linkd with Mersenne and Fermat numbers  T.Rex  Math  4  20050507 08:25 