%I
%S 1,20,21,31,32,42,43,53,54,64,65,75,76,86,87,97,98,108,100,20,21,31,
%T 32,42,43,53,54,64,65,75,76,86,87,97,98,108,100,20,21,31,32,42,43,53,
%U 54,64,65,75,76,86,87,97,98,108,100,20,21,31,32,42,43,53,54,64,65,75,76,86,87
%N Start with 1 and repeatedly place the first digit at the end of the number and add 19.
%C After 1 step the sequence enters a cycle of length 18.
%K base,nonn
%O 1,2
%A Luc Stevens (lms022(AT)yahoo.com), May 24 2006
