OFFSET
1,1
COMMENTS
It seems that {10,1}, {13,16} and {9,18} are the only iterative cycles with 2 distinct elements.
EXAMPLE
7 -> 4+9 = 13 -> 1+6+9 = 16 -> 2+5+6 = 13, thus only {13,16} are contained in the iterative cycle of 7. 24 -> 5+7+6 = 18 -> 3+2+4 = 9 -> 8+1 = 9, thus {18,9} are the only elements of the iterative cycle of 24.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Asher Auel, May 17 2001
STATUS
approved