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A043594
Numbers whose base-4 representation has exactly 3 runs.
0
17, 18, 19, 24, 25, 27, 28, 29, 30, 33, 34, 35, 36, 38, 39, 44, 45, 46, 49, 50, 51, 52, 54, 55, 56, 57, 59, 65, 66, 67, 69, 74, 79, 81, 82, 83, 88, 89, 91, 92, 93, 94, 96, 101, 104, 105, 107, 111, 112, 117, 122, 124, 125, 126, 129, 130
OFFSET
1,1
MATHEMATICA
Select[Range[200], Length[Split[IntegerDigits[#, 4]]]==3&] (* Harvey P. Dale, May 29 2019 *)
CROSSREFS
Cf. A007090.
Sequence in context: A380786 A018822 A304488 * A043825 A043831 A043835
KEYWORD
nonn,base
STATUS
approved