Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #5 Dec 05 2013 19:56:00
%S 9,99,9009,900900,90090000,9009000000,900900000000,90090000000000,
%T 9009000000000000,900900000000000000,90090000000000000000,
%U 9009000000000000000000,900900000000000000000000
%N a(1) =9, a(n) = smallest multiple of a(n-1) (not equal to 10*a(n-1)) obtained by inserting digits anywhere in a(n-1).
%Y Cf. A080486, A080487, A080488, A080489, A080490, A080491, A080492, A080493.
%K base,nonn
%O 1,1
%A _Amarnath Murthy_, Mar 18 2003
%E Corrected and extended by _Ray Chandler_, Oct 11 2003