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Smallest available number such that the last digit of n and the first digit of n+1 sum to 2.
0

%I #2 Mar 31 2012 13:46:50

%S 1,10,20,21,11,100,200,201,101,110,210,211,111,120,220,221,121,130,

%T 230,231,131,140,240,241,141,150,250,251,151,160,260,261,161,170,270,

%U 271,171,180,280,281,181,190,290,291,191,1000,2010,2011,1001,1010,2020

%N Smallest available number such that the last digit of n and the first digit of n+1 sum to 2.

%K base,easy,nonn

%O 1,2

%A _Eric Angelini_, Oct 25 2004