A043719 Numbers whose base-16 representation has an odd number of runs.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 273, 288, 289, 291, 292, 293, 294, 295

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Programs

Python

from itertools import groupby
def ok(n): return len(list(g for k, g in groupby(hex(n)[2:])))%2 == 1
print(list(filter(ok, range(1, 296)))) # Michael S. Branicky, Jun 18 2021