A043845 Numbers k such that number of runs in the base 4 representation of k is congruent to 2 mod 7.

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, 80, 84, 86, 87, 90, 95, 106, 127, 128, 149, 160, 165, 168, 169, 171, 175, 191, 192, 213, 234, 240, 245, 250, 252, 253, 254, 256

Offset

1,1

Links

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

Mathematica

Select[Range[300], Mod[Length[Split[IntegerDigits[#, 4]]], 7]==2&] (* Harvey P. Dale, Feb 20 2026 *)

Crossrefs

Sequence in context: A043830 A043834 A043839 * A043852 A043860 A043869

Adjacent sequences: A043842 A043843 A043844 * A043846 A043847 A043848

Keyword

nonn,base

Author

Clark Kimberling

Status

approved