A025482 a(0) = 0; a(n) = a(n/3)/3 if n = a(n/3) = 0 (mod 3); a(n) = a(n-1)+1 otherwise.

0, 1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 3, 4, 5, 6, 7, 8, 9, 10, 11, 4, 5, 6, 7, 8, 9, 10, 11, 12, 5, 6, 7, 8, 9, 10

Offset

0,3

Comments

Bounded, conjectured maximum is a(257) = 17.

Links

Robert Israel, Table of n, a(n) for n = 0..10000

Maple

A[0]:= 0;
for n from 1 to 1000 do
  if n mod 3 = 0 and A[n/3] mod 3 = 0 then A[n]:= A[n/3]/3
  else A[n]:= A[n-1]+1
fi od:
seq(A[i], i=0..1000); # Robert Israel, Apr 25 2017

Crossrefs

Sequence in context: A338496 A053830 A033929 * A375481 A023125 A319657

Adjacent sequences: A025479 A025480 A025481 * A025483 A025484 A025485

Keyword

nonn

Author

David W. Wilson

Status

approved