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If n is squarefree then A090705(A100112(n)) else n.
5

%I #7 Mar 30 2012 18:50:48

%S 1,2,6,4,3,10,5,8,9,14,7,12,15,11,21,16,13,18,22,20,17,26,19,24,25,33,

%T 27,28,23,34,29,32,35,30,38,36,31,39,37,40,46,41,51,44,45,42,55,48,49,

%U 50,43,52,57,54,47,56,58,53,62,60,59,65,63,64,61,69,66,68,74,67,77,72

%N If n is squarefree then A090705(A100112(n)) else n.

%C a(A005117(n)) = A090705(n) and a(A013929(n)) = A013929(n);

%C A102511(n) = Sum(A008683(a(k)): k<=n) <= 1;

%C permutation of the natural numbers with inverse A102513;

%C A102512 = a(a(n)).

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

%Y Cf. A005117, A008966.

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Jan 13 2005