%N a(1) = 1, a(n) = if n mod 10 = 0 then n else smallest number m, not occurring earlier such that m*a(n-d) is a palindrome, where d = if n mod 10 = 1 then 2 else 1.
%C Permutation of natural numbers: a(A083665(n))=A083665(a(n))=n;
%C for n>1: a(n)=n iff n == 0 modulo 10.
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%Y Cf. A083666, A083125, A002113.
%A _Reinhard Zumkeller_, May 02 2003