%I A043618
%S A043618 50,51,52,53,54,55,63,64,66,67,68,69,70,71,72,74,75,76,77,78,
%T A043618 79,80,82,83,84,85,86,87,88,90,91,92,93,94,95,96,99,100,101,102,
%U A043618 103,104,105,107,108,109,110,111,119,120,121,123,124,125,126
%N A043618 Numbers n such that base 7 representation has exactly 3 runs.
%Y A043618 Sequence in context: A033980 A165871 A078289 this_sequence A134691 A139182 
               A081646
%Y A043618 Adjacent sequences: A043615 A043616 A043617 this_sequence A043619 A043620 
               A043621
%K A043618 nonn,base
%O A043618 1,1
%A A043618 Clark Kimberling (ck6(AT)evansville.edu)