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If d,e are consecutive digits of n in base 9, then |d-e|>=5.
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%I #5 Mar 30 2012 18:56:25

%S 1,2,3,4,5,6,7,8,15,16,17,25,26,35,45,54,55,63,64,65,72,73,74,75,135,

%T 136,144,145,146,153,154,155,156,225,226,227,234,235,236,237,315,316,

%U 317,318,410,411,412,413,491,492,493,494,501,502

%N If d,e are consecutive digits of n in base 9, then |d-e|>=5.

%K nonn,base

%O 1,2

%A _Clark Kimberling_