A086572 - OEIS

%I #8 Mar 30 2012 18:50:37

%S 2,1,9,6,10,4,14,12,3,5,22,8,26,7,45,32,34,24,38,30,63,11,46,18,50,13,

%T 36,42,58,20,62,16,99,17,70,27,74,19,117,100,82,28,86,66,15,23,94,60,

%U 98,25,153,78,106,72,110,84,171,29,118,48,122,31,21,80,130,44,134

%N Solution to A086571(a(n))=A086571(n) and a(n)<>n.

%C Well defined as each number occurs exactly twice in A086571;

%C a self-inverse permutation of natural numbers: a(a(n))=n.

%C A086938(n) = a(A086939(n)), A086939(n) = a(A086938(n)). - _Reinhard Zumkeller_, Jul 24 2003

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

%e A086571(8)=4 and A086571(12)=4, therefore a(8)=12 and a(12)=8.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Jul 22 2003