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A060587 A ternary code: inverse of A060583. 6
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 22 16:22 EDT 2020. Contains 337291 sequences. (Running on oeis4.)