A043251 - OEIS

%I #8 Aug 24 2021 06:30:27

%S 56,65,156,165,256,265,356,365,456,465,556,560,650,665,756,765,856,

%T 865,956,965,1056,1065,1156,1165,1256,1265,1356,1365,1456,1465,1556,

%U 1560,1650,1665,1756,1765,1856,1865,1956,1965,2056

%N Numbers k such that 5 and 6 occur juxtaposed in the base-10 representation of k but not of k-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_