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As exponents in powers of 2 or 3 (A006899) occur in A085238 exactly twice, a self-inverse permutation of natural numbers is induced.
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%I #6 Mar 30 2012 18:50:36

%S 2,1,5,7,3,10,4,12,15,6,18,8,20,23,9,25,28,11,31,13,33,36,14,38,16,41,

%T 43,17,46,49,19,51,21,54,56,22,59,24,62,64,26,67,27,69,72,29,74,77,30,

%U 80,32,82,85,34,87,35,90,93,37,95,98,39,100,40,103,105,42,108

%N As exponents in powers of 2 or 3 (A006899) occur in A085238 exactly twice, a self-inverse permutation of natural numbers is induced.

%C A085238(n)=A085238(a(n)); a(a(n))=n.

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

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Jun 22 2003