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Numbers n such that string 3,1 occurs in the base 7 representation of n but not of n+1.
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%I #5 Mar 30 2012 18:56:45

%S 22,71,120,160,169,218,267,316,365,414,463,503,512,561,610,659,708,

%T 757,806,846,855,904,953,1002,1051,1126,1149,1189,1198,1247,1296,1345,

%U 1394,1443,1492,1532,1541,1590,1639,1688,1737,1786

%N Numbers n such that string 3,1 occurs in the base 7 representation of n but not of n+1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_