

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
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OFFSET

0,2


COMMENTS

Write n in base 3, then (working from left to right) if the kth digit of n is equal to the digit to the left of it then this is the kth digit of a(n), otherwise the kth 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( = 320), a second digit of 2( = 2 = 2), a third digit of 0( = 312) 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



