A043693 Numbers whose base-4 representation has an even number of runs.

4, 6, 7, 8, 9, 11, 12, 13, 14, 16, 20, 22, 23, 26, 31, 32, 37, 40, 41, 43, 47, 48, 53, 58, 60, 61, 62, 64, 68, 70, 71, 72, 73, 75, 76, 77, 78, 80, 84, 86, 87, 90, 95, 97, 98, 99, 100, 102, 103, 106, 108, 109, 110, 113, 114, 115, 116, 118

Offset

1,1

Links

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

Mathematica

Select[Range[120], EvenQ[Length[Split[IntegerDigits[#, 4]]]]&] (* Harvey P. Dale, Oct 19 2018 *)

Crossrefs

Sequence in context: A138887 A216845 A031949 * A043593 A043827 A043830

Adjacent sequences: A043690 A043691 A043692 * A043694 A043695 A043696

Keyword

nonn,base

Author

Clark Kimberling

Status

approved