%I
%S 1,2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,21,31,32,34,35,36,37,38,39,
%T 41,42,51,52,53,54,56,57,58,59,61,62,63,71,72,73,74,75,76,78,79,81,82,
%U 83,84,121,312,412
%N Slowest increasing sequence such that no digit "d" has a copy of itself at "d" digits, left or right.
%e Take integer [78] in the sequence for instance : ...73 74 75 76 [78] 79 81 82 83...
%e The digit "7", jumping 7 digits back, ends on "3" [73] which is not "7"; jumping 7 digits to the right ends on "2" which, again, is not a "7". The same can be said for "8" (left > "7"; right > "3")
%Y Cf. A102150.
%K base,easy,nonn
%O 1,2
%A _Eric Angelini_, Feb 18 2005
