This is an attempt to collect all known sociable numbers of order four (see also Known Sociable Numbers of order different from four). I would appreciate receiving any kind of updates and corrections. Comments are welcome too. Please visit my tables of other kinds of aliquot cycles.
The table below contains the number of sociable numbers arranged according to the number of digits in the smallest member. Click on the number of cycles to see the full list of cycles. Use your browsers back function to get back here. The lists contains all cycles with the member preceeding the largest member below 5×1012.
| Digits | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||||||||||
| 0-9 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 5 | 4 | |||||||||||
| 10-19 | 10 | 8 | 4 | 8 | 4 | 4 | 7 | 6 | 2 | 4 | ||||||||||
| 20-29 | 4 | 4 | 6 | 3 | 7 | 5 | 4 | 3 | 3 | 1 | ||||||||||
| 30-39 | 2 | 5 | 2 | 0 | 0 | 4 | 3 | 2 | 0 | 2 | ||||||||||
| 40-49 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 2 | 1 | 0 | ||||||||||
| 50-59 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | ||||||||||
| total 142 quadruples | ||||||||||||||||||||