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

%I A331275 #9 Jan 14 2020 01:26:22
%S A331275 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,
%T A331275 27,36,63,30,39,66,57,64,75,28,37,58,31,40,67,48,49,76,55,46,73,42,43,
%U A331275 70,69,68,79,54,45,72,33,38,65,60,61,78,29,34,59,32,41
%N A331275 a(n) is the greatest ternary anagram of n not yet in the sequence.
%C A331275 Leading zeros are ignored.
%C A331275 This sequence is a self-inverse permutation of the natural numbers.
%H A331275 Rémy Sigrist, <a href="/A331275/b331275.txt">Table of n, a(n) for n = 1..6561</a>
%H A331275 Rémy Sigrist, <a href="/A331275/a331275.gp.txt">PARI program for A331275</a>
%H A331275 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%e A331275 The first terms, in decimal and in ternary, are:
%e A331275   n   a(n)  ter(n)  ter(a(n))
%e A331275   --  ----  ------  ---------
%e A331275    1     1       1          1
%e A331275    2     2       2          2
%e A331275    3     3      10         10
%e A331275    4     4      11         11
%e A331275    5     7      12         21
%e A331275    6     6      20         20
%e A331275    7     5      21         12
%e A331275    8     8      22         22
%e A331275    9     9     100        100
%e A331275   10    12     101        110
%e A331275   11    21     102        210
%e A331275   12    10     110        101
%e A331275   13    13     111        111
%e A331275   14    22     112        211
%e A331275   15    19     120        201
%o A331275 (PARI) See Links section.
%Y A331275 Cf. A331274 (binary analog).
%K A331275 nonn,base
%O A331275 1,2
%A A331275 _Rémy Sigrist_, Jan 13 2020