A043844 Numbers n such that number of runs in the base 4 representation of n is congruent to 1 mod 7.

1, 2, 3, 5, 10, 15, 21, 42, 63, 85, 170, 255, 341, 682, 1023, 1365, 2730, 4095, 5461, 10922, 16383, 17476, 17478, 17479, 17480, 17481, 17483, 17484, 17485, 17486, 17505, 17506, 17507, 17508, 17510, 17511, 17516, 17517, 17518

Offset

1,2

Links

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

Mathematica

Select[Range[18000], Mod[Length[Split[IntegerDigits[#, 4]]], 7]==1&] (* Harvey P. Dale, Mar 15 2026 *)

Crossrefs

Sequence in context: A043829 A043833 A043838 * A043851 A043859 A043868

Adjacent sequences: A043841 A043842 A043843 * A043845 A043846 A043847

Keyword

nonn,base

Author

Clark Kimberling

Status

approved