A031008 - OEIS

%I #13 Apr 10 2020 07:45:42

%S 0,7,21,35,49,63,77,91,92,95,98,101,104,107,110,112,133,154,175,196,

%T 217,238,239,242,245,248,251,254,257,259,280,301,322,343,364,385,386,

%U 389,392,395,398,401,404,406,427,448,469,490,511

%N Position of n-th 0 in A031007.

%t Rest[Flatten[Position[Flatten[Table[Reverse[IntegerDigits[n,7]],{n,0,200}]],0]]]-1 (* _Harvey P. Dale_, Jun 08 2017 *)

%K nonn,base

%O 1,2

%A _Clark Kimberling_

%E Missing a(1)=0 inserted by _Sean A. Irvine_, Apr 10 2020