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Inverse permutation to A353826.
2

%I #8 May 10 2022 02:26:23

%S 0,1,2,3,4,8,6,7,5,9,10,20,12,13,17,24,25,23,18,19,11,21,22,26,15,16,

%T 14,27,28,56,30,31,35,60,61,59,36,37,47,39,40,44,51,52,50,72,73,65,75,

%U 76,80,69,70,68,54,55,29,57,58,62,33,34,32,63,64,74,66,67

%N Inverse permutation to A353826.

%H Rémy Sigrist, <a href="/A353827/b353827.txt">Table of n, a(n) for n = 0..6561</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%e A353826(11) = 20, so a(20) = 11.

%o (PARI) a(n) = { my (d=digits(n,3), p=Mod(1,3)); forstep (k=#d, 1, -1, if (d[k], p*=d[k]=lift(d[k]/p))); fromdigits(d, 3) }

%Y Cf. A353826.

%K nonn,base

%O 0,3

%A _Rémy Sigrist_, May 08 2022