A043988 - OEIS

%I #9 Aug 27 2021 01:45:07

%S 43,67,124,148,205,229,286,310,367,395,448,472,529,553,611,634,691,

%T 715,772,796,853,877,934,958,1015,1039,1096,1124,1177,1201,1258,1282,

%U 1340,1363,1420,1444,1501,1525,1582,1606,1663,1687

%N Numbers k such that 4 and 7 occur juxtaposed in the base-9 representation of k but not of k+1.

%Y Cf. A007095.

%K nonn,base

%O 1,1

%A _Clark Kimberling_