%I A026239
%S A026239 1,4,6,2,8,3,9,5,7,11,10,13,12,17,19,23,14,29,15,31,37,41,16,
%T A026239 43,47,53,59,61,18,67,20,71,73,79,83,89,21,97,101,103,22,107,
%U A026239 24,109,113,127,25,131,137,139,149,151,26,157,163,167,173,179
%N A026239 Beginning with the natural numbers, swap the k-th prime and k-th composite.
%C A026239 Self-inverse permutation of natural numbers.
%H A026239 <a href="Sindx_Per.html#IntegerPermutation">Index entries for sequences 
               that are permutations of the natural numbers</a>
%F A026239 a(1) = 1 and a(n) = if n is prime then A002808(A049084(n)) else A000040(A066246(n)) 
               for n>1. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               Dec 13, 2001
%Y A026239 Sequence in context: A065165 A088516 A114538 this_sequence A114579 A021220 
               A095196
%Y A026239 Adjacent sequences: A026236 A026237 A026238 this_sequence A026240 A026241 
               A026242
%K A026239 nonn
%O A026239 1,2
%A A026239 Clark Kimberling (ck6(AT)evansville.edu)