A331275 a(n) is the greatest ternary anagram of n not yet in the sequence.

1, 2, 3, 4, 7, 6, 5, 8, 9, 12, 21, 10, 13, 22, 19, 16, 25, 18, 15, 24, 11, 14, 23, 20, 17, 26, 27, 36, 63, 30, 39, 66, 57, 64, 75, 28, 37, 58, 31, 40, 67, 48, 49, 76, 55, 46, 73, 42, 43, 70, 69, 68, 79, 54, 45, 72, 33, 38, 65, 60, 61, 78, 29, 34, 59, 32, 41

Offset: 1

Author

Rémy Sigrist, Jan 13 2020

Keywords

• nonn
• base

Comments

Leading zeros are ignored.

This sequence is a self-inverse permutation of the natural numbers.

Examples

			The first terms, in decimal and in ternary, are:
  n   a(n)  ter(n)  ter(a(n))
  --  ----  ------  ---------
   1     1       1          1
   2     2       2          2
   3     3      10         10
   4     4      11         11
   5     7      12         21
   6     6      20         20
   7     5      21         12
   8     8      22         22
   9     9     100        100
  10    12     101        110
  11    21     102        210
  12    10     110        101
  13    13     111        111
  14    22     112        211
  15    19     120        201
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..6561
• Rémy Sigrist, PARI program for A331275
• Index entries for sequences that are permutations of the natural numbers

Crossrefs

Cf. A331274 (binary analog).

Programs

PARI

See Links section.