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A043725 Numbers n such that number of runs in base 2 representation of n 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[250], Mod[Length[Split[IntegerDigits[#, 2]]], 4]==1&] (* Harvey P. Dale, Dec 10 2018 *)

CROSSREFS

Sequence in context: A153829 A153830 A080550 * A182247 A121712 A175544

Adjacent sequences:  A043722 A043723 A043724 * A043726 A043727 A043728

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 16 11:44 EDT 2021. Contains 347472 sequences. (Running on oeis4.)