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Numbers n such that string 1,4 occurs in the base 7 representation of n but not of n-1.
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%I #5 Mar 30 2012 18:56:42

%S 11,60,77,109,158,207,256,305,354,403,420,452,501,539,599,648,697,746,

%T 763,795,844,893,942,991,1040,1089,1106,1138,1187,1236,1285,1334,1383,

%U 1432,1449,1481,1530,1579,1628,1677,1726,1775

%N Numbers n such that string 1,4 occurs in the base 7 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_