%I

%S 21,37,41,43,45,53,69,73,75,77,81,83,87,89,91,93,101,105,107,109,117,

%T 133,137,139,141,145,147,151,153,155,157,161,163,167,175,177,179,183,

%U 185,187,189,197,201,203,205,209,211,215,217

%N Numbers n such that number of runs in the base 2 representation of n is congruent to 5 mod 7.

%K nonn,base

%O 1,1

%A _Clark Kimberling_