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a(1) = 1; for n>1, a(n) = smallest number > a(n-1) such that last digit of a(n-1) + first digit of a(n) = 3.
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%I #7 Mar 31 2012 13:46:50

%S 1,2,10,30,31,200,300,301,2000,3000,3001,20000,30000,30001,200000,

%T 300000,300001,2000000,3000000,3000001,20000000,30000000,30000001,

%U 200000000,300000000,300000001,2000000000,3000000000,3000000001

%N a(1) = 1; for n>1, a(n) = smallest number > a(n-1) such that last digit of a(n-1) + first digit of a(n) = 3.

%K base,easy,nonn

%O 1,2

%A _Eric Angelini_, Oct 26 2004

%E Edited by _N. J. A. Sloane_ following email from Zak Seidov, Mar 05 2005

%E More terms from _Joshua Zucker_, Jun 21 2006