A043144 - OEIS

%I #8 Aug 22 2021 22:15:41

%S 19,37,68,86,117,133,166,184,215,233,259,282,313,331,362,380,411,429,

%T 460,476,509,527,558,576,602,625,656,674,705,723,754,772,803,819,852,

%U 870,901,919,931,999,1017,1048,1066,1097,1115

%N Numbers k such that 2 and 5 occur juxtaposed in the base-7 representation of k but not of k-1.

%Y Cf. A007093.

%K nonn,base

%O 1,1

%A _Clark Kimberling_