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A044873 Numbers having, in base 2, (sum of even run lengths)=(sum of odd run lengths). 3

%I

%S 9,11,13,133,135,140,143,146,148,150,152,154,156,161,164,166,172,175,

%T 178,180,182,189,196,198,200,202,206,210,212,214,216,218,220,225,228,

%U 230,236,239,241,245,247,2065,2069,2071,2077

%N Numbers having, in base 2, (sum of even run lengths)=(sum of odd run lengths).

%o (Python)

%o from itertools import groupby

%o def ok(n):

%o rl_sums = [0, 0]

%o for k, g in groupby(bin(n)[2:]):

%o rl = len(list(g))

%o rl_sums[rl%2] += rl

%o return rl_sums[0] == rl_sums[1]

%o print(list(filter(ok, range(2078)))) # _Michael S. Branicky_, Sep 11 2021

%Y Cf. A007088.

%Y Cf. A044874, A044875, A044876, A044877, A044878, A044879, A044880.

%Y Cf. A044881, A044882, A044883, A044884, A044885, A044886, A044887.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified July 5 23:30 EDT 2022. Contains 355105 sequences. (Running on oeis4.)