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A043693 Numbers whose base-4 representation has an even number of runs. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)