%I A032989
%S A032989 1,2,3,4,5,6,12,13,20,28,35,36,42,43,44,84,85,91,92,93,140,141,
%T A032989 142,200,201,202,249,250,251,257,258,298,299,300,306,307,314,
%U A032989 592,593,594,600,601,641,642,643,649,650,657,984,985,986,992
%N A032989 If d,e are consecutive digits of n in base 7, then |d-e|>=4.
%Y A032989 Sequence in context: A032861 A032885 A023788 this_sequence A108320 A032941 
               A059460
%Y A032989 Adjacent sequences: A032986 A032987 A032988 this_sequence A032990 A032991 
               A032992
%K A032989 nonn,base
%O A032989 1,2
%A A032989 Clark Kimberling (ck6(AT)evansville.edu)