A060587 A ternary code: inverse of A060583.

0, 2, 1, 8, 7, 6, 4, 3, 5, 24, 26, 25, 23, 22, 21, 19, 18, 20, 12, 14, 13, 11, 10, 9, 16, 15, 17, 72, 74, 73, 80, 79, 78, 76, 75, 77, 69, 71, 70, 68, 67, 66, 64, 63, 65, 57, 59, 58, 56, 55, 54, 61, 60, 62, 36, 38, 37, 44, 43, 42, 40, 39, 41, 33, 35, 34, 32, 31, 30, 28, 27, 29

Offset

0,2

Comments

Write n in base 3, then (working from left to right) if the k-th digit of n is equal to the digit to the left of it then this is the k-th digit of a(n), otherwise the k-th digit of a(n) is the element of {0,1,2} which has not just been compared, then read result as a base 3 number.

Links

Alois P. Heinz, Table of n, a(n) for n = 0..6560

Index entries for sequences that are permutations of the natural numbers

Formula

a(n) = 3a([n/3])+(-[n/3]-n mod 3) = 3a([n/3]) + A060588(n).

a(n) = A253586(n,floor(n/3)) = A253587(n,floor(n/3)). - Alois P. Heinz, Jan 09 2015

Example

a(76) = 46 since 76 written in base 3 is 2211; this gives a first digit of 1( = 3-2-0), a second digit of 2( = 2 = 2), a third digit of 0( = 3-1-2) and a fourth digit of 1( = 1 = 1); 1201 base 3 is 46.

Crossrefs

Cf. A060583, A060588, A253586, A253587.

Sequence in context: A197018 A082532 A049250 * A168142 A081800 A254180

Adjacent sequences: A060584 A060585 A060586 * A060588 A060589 A060590

Keyword

base,nonn

Author

Henry Bottomley, Apr 04 2001

Status

approved