OFFSET
1,1
COMMENTS
Coincides with sequence "Number of runs in the base 10 representation of n is even" until reaching 1234.
From Robert Israel, Sep 26 2016: (Start)
Numbers of the form (a*(10^i-10^j) + b*(10^j-1))/9 for some i > j >= 0, a <> b with 1 <= a <= 9, 0 <= b <= 9.
There are 81*(d-1) terms with d digits for each d >= 2. (End)
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
sort([seq(seq(seq(seq((a*(10^i-10^j)+b*(10^j-1))/9, a={$1..9} minus {b}), b=0..9), j=1..i-1), i=2..4)]); # Robert Israel, Sep 26 2016
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved