OFFSET
1,1
COMMENTS
It appears that, for initial i=660880440, the sequence x->S(x) diverges.
Barring such cases, the next 3 terms would be 775898880, 874897408 and 1476304896.
EXAMPLE
120 -> 120 so 120 is a term, a 3-perfect number.
7680 -> 8184 -> 7680, a group of 2 sociable terms.
7560 -> 9600 -> 10540 -> 8064 -> 8840 -> 7560, a group of 5 sociable terms.
34944 -> 38080 -> 36576 -> 34944, a group of 3 sociable terms.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Michel Marcus, Aug 11 2022
STATUS
approved