OFFSET
1,2
MATHEMATICA
Rest[Flatten[Position[Flatten[Table[Reverse[IntegerDigits[n, 7]], {n, 0, 200}]], 0]]]-1 (* Harvey P. Dale, Jun 08 2017 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Missing a(1)=0 inserted by Sean A. Irvine, Apr 10 2020
STATUS
approved