A043705 Numbers whose base-16 representation has an even number of runs.

16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79

Offset

1,1

Links

Table of n, a(n) for n=1..60.

Prog

(Python)
from itertools import groupby
def ok(n): return len(list(g for k, g in groupby(hex(n)[2:])))%2 == 0
print(list(filter(ok, range(1, 80)))) # Michael S. Branicky, Jun 18 2021

Crossrefs

Sequence in context: A358677 A085096 A043675 * A374594 A178980 A031315

Adjacent sequences: A043702 A043703 A043704 * A043706 A043707 A043708

Keyword

nonn,base

Author

Clark Kimberling

Status

approved