Reasearch of Natural Digital Cube Sum Mapping Number Sequence
Ying Wang · Journal of Tianshui Normal University · 2003
The fact that there are only nine circles in the figure (N,T) has been proved. For arbitrary natural number n0, natural number K0 exists, so that sufficient and necessary conditions for T k(n0) entering correwsponding circle, when K ≥K0, have been given.