A352760 - OEIS

A352760

Lexigraphically earliest sequence of distinct nonnegative integers such that for any n >= 0, among the ternary digits of n and a(n) (counted with multiplicity) there are as many 1's as 2's.

0, 2, 1, 6, 8, 5, 3, 7, 4, 17, 20, 11, 24, 26, 18, 15, 23, 9, 14, 19, 10, 21, 25, 16, 12, 22, 13, 35, 53, 29, 56, 62, 47, 33, 51, 27, 60, 74, 54, 78, 80, 71, 59, 72, 44, 45, 61, 32, 65, 77, 50, 34, 52, 28, 38, 55, 30, 57, 69, 42, 36, 46, 31, 63, 73, 48, 75, 79

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OFFSET

0,2

COMMENTS

This sequence is a self-inverse permutation of the nonnegative integers.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 0..6560

Rémy Sigrist, PARI program

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = n iff n belongs to A039001.

a(n) < 3^k iff n < 3^k.

EXAMPLE

The first terms, alongside their ternary expansions, are:

n a(n) ter(n) ter(a(n))

-- ---- ------ ---------

0 0 0 0

1 2 1 2

2 1 2 1

3 6 10 20

4 8 11 22

5 5 12 12

6 3 20 10

7 7 21 21

8 4 22 11

9 17 100 122

10 20 101 202

11 11 102 102

12 24 110 220

PROG

(PARI) See Links section.

CROSSREFS

Cf. A004488, A039001 (fixed points), A331275, A355504.

Sequence in context: A138750 A342369 A342842 * A357616 A048850 A004488

Adjacent sequences: A352757 A352758 A352759 * A352761 A352762 A352763

KEYWORD

nonn,base

AUTHOR

Rémy Sigrist, Jul 05 2022

STATUS

approved