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A043725
Numbers whose number of runs in the base-2 representation is congruent to 1 mod 4.
3
1, 3, 7, 15, 21, 31, 37, 41, 43, 45, 53, 63, 69, 73, 75, 77, 81, 83, 87, 89, 91, 93, 101, 105, 107, 109, 117, 127, 133, 137, 139, 141, 145, 147, 151, 153, 155, 157, 161, 163, 167, 175, 177, 179, 183, 185, 187, 189, 197, 201, 203, 205
OFFSET
1,2
LINKS
Paul Barry, Conjectures and results on some generalized Rueppel sequences, arXiv:2107.00442 [math.CO], 2021.
MATHEMATICA
Select[Range[250], Mod[Length[Split[IntegerDigits[#, 2]]], 4]==1&] (* Harvey P. Dale, Dec 10 2018 *)
CROSSREFS
Sequence in context: A153830 A080550 A348943 * A182247 A121712 A175544
KEYWORD
nonn,base
STATUS
approved