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If d,e are consecutive digits of n in base 8, then |d-e|>=5.
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%I #5 Mar 30 2012 18:56:25

%S 1,2,3,4,5,6,7,14,15,23,40,48,49,56,57,58,112,113,120,121,122,184,185,

%T 186,325,326,327,389,390,391,398,399,453,454,455,462,463,471,901,902,

%U 903,910,911,965,966,967,974,975,983,1477,1478

%N If d,e are consecutive digits of n in base 8, then |d-e|>=5.

%K nonn,base

%O 1,2

%A _Clark Kimberling_