OFFSET
1,2
COMMENTS
The distance is defined as the number of steps needed to reach the origin (analog of Manhattan distance).
a(n) ~ c*n^2; however, the first several hundreds of terms are very well described by the approximate formula c'*n^(2.8). [amended by Andrey Zabolotskiy, Oct 09 2016 and Nov 02 2016]
LINKS
Andrey Zabolotskiy, Table of n, a(n) for n = 1..1500 (calculated using Oleg Nikulin's program)
Wikipedia, Turmite
CROSSREFS
KEYWORD
nonn
AUTHOR
Oleg Nikulin, Jul 22 2016
STATUS
approved