A043829 - OEIS

A043829

Numbers k such that number of runs in the base 4 representation of k is congruent to 1 mod 4.

1, 2, 3, 5, 10, 15, 21, 42, 63, 85, 170, 255, 273, 274, 275, 280, 281, 283, 284, 285, 286, 289, 290, 291, 292, 294, 295, 300, 301, 302, 305, 306, 307, 308, 310, 311, 312, 313, 315, 341, 388, 390, 391, 392, 393, 395, 396, 397, 398

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OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..2000

MATHEMATICA

Select[Range[400], Mod[Length[Split[IntegerDigits[#, 4]]], 4]==1&] (* Harvey P. Dale, Aug 18 2025 *)

CROSSREFS

Cf. A007090.

Sequence in context: A037387 A256055 A043826 * A043833 A043838 A043844

Adjacent sequences: A043826 A043827 A043828 * A043830 A043831 A043832

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved