A043696 Numbers whose base-7 representation has an even number of runs.

7, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 49, 56, 58, 59, 60, 61, 62, 65, 73, 81, 89, 97, 98, 106, 112, 113, 115, 116, 117, 118, 122, 130

Offset

1,1

Links

Table of n, a(n) for n=1..58.

Mathematica

Select[Range[200], EvenQ[Length[Split[IntegerDigits[#, 7]]]]&] (* Harvey P. Dale, Nov 17 2013 *)

Crossrefs

Sequence in context: A112954 A031952 A043617 * A043397 A008536 A031000

Adjacent sequences: A043693 A043694 A043695 * A043697 A043698 A043699

Keyword

nonn,base

Author

Clark Kimberling

Status

approved