# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a083664 Showing 1-1 of 1 %I A083664 #6 Mar 30 2012 18:50:34 %S A083664 1,2,3,11,4,22,28,9,19,10,17,16,29,8,34,88,7,23,18,20,14,31,154,13,38, %T A083664 231,12,21,25,30,209,42,6,37,15,35,143,49,77,40,26,33,47,303,57,333, %U A083664 64,66,32,50,132,48,44,53,404,58,364,111,5,60,101,55,91,99,46,437,92,236 %N A083664 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 A083664 Permutation of natural numbers: a(A083665(n))=A083665(a(n))=n; %C A083664 for n>1: a(n)=n iff n == 0 modulo 10. %H A083664 Index entries for sequences that are permutations of the natural numbers %Y A083664 Cf. A083666, A083125, A002113. %K A083664 nonn,base %O A083664 1,2 %A A083664 _Reinhard Zumkeller_, May 02 2003 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE