1.Take a random positive integer, divisible by three.
2.Consider its base 10 digits.
3.Take the sum of their cubes.
4.Go back to step 2.
Rem: You may limit your research for n<1000.
See The Solution  Submitted by Ady TZIDON 
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re(2): nonanalytic solution 

(In reply to re: nonanalytic solution by Daniel)
Daniel 
"1.Take a random positive integer, divisible by three."
25 is not divisible by 3.
Posted by Dej Mar on 20150918 01:03:15 