OFFSET
1,2
COMMENTS
The values of m which take this many steps are 1, 11, 101, 1001, 10001, 100001, 1000001, 10000001, 100000001, ...
LINKS
N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki.
FORMULA
a(n) = 1 + 9*(n-1) for odd n; a(n) = 9*n for even n. Recursion: a(1) = 1; a(2) = 18; a(n+1) = a(n-1) + 18. - (Klaus Brockhaus, Jul 28 2006)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, May 06 2006
EXTENSIONS
a(5) to a(9) from Klaus Brockhaus, Jul 28 2006
STATUS
approved