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A215089
a(n)=Sum{d(i)*6^i: i=0,1,...,m}, where Sum{d(i)*2^i: i=0,1,...,m} is the base 2 representation of n.
1
0, 1, 2, 3, 4, 5, 2, 3, 4, 5, 6, 7, 4, 5, 6, 7, 8, 9, 6, 7, 8, 9, 10, 11, 8, 9, 10, 11, 12, 13, 10, 11, 12, 13, 14, 15, 4, 5, 6, 7, 8, 9, 6, 7, 8, 9, 10, 11, 8, 9, 10, 11, 12, 13, 10, 11, 12, 13, 14, 15, 12, 13, 14, 15, 16, 17, 14, 15, 16, 17, 18, 19, 8, 9, 10, 11, 12, 13, 10
OFFSET
0,3
LINKS
FORMULA
a(n) = 2*a(n/6) if n = 0 mod 6; otherwise a(n) = a(n-1)+1.
MATHEMATICA
t = Table[FromDigits[RealDigits[n, 6], 2], {n, 0, 100}]
CROSSREFS
Cf. A033043.
Sequence in context: A173525 A070772 A094937 * A329243 A375636 A161768
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Aug 03 2012
STATUS
approved