A044026 - OEIS

%I #9 Aug 29 2021 01:55:28

%S 45,54,145,154,245,254,345,354,445,459,549,554,645,654,745,754,845,

%T 854,945,954,1045,1054,1145,1154,1245,1254,1345,1354,1445,1459,1549,

%U 1554,1645,1654,1745,1754,1845,1854,1945,1954,2045

%N Numbers k such that 4 and 5 occur juxtaposed in the base-10 representation of k but not of k+1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_