A044881 Numbers having, in base 10, (sum of even run lengths)=(sum of odd run lengths).

1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1011, 1022, 1033, 1044, 1055, 1066, 1077, 1088, 1099, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109, 1120, 1121, 1123, 1124, 1125, 1126, 1127, 1128, 1129

Offset

1,1

Links

Table of n, a(n) for n=1..36.

Prog

(Python)
from itertools import groupby
def ok(n):
    rl_sums = [0, 0]
    for k, g in groupby(str(n)):
        rl = len(list(g))
        rl_sums[rl%2] += rl
    return rl_sums[0] == rl_sums[1]
print(list(filter(ok, range(1130)))) # Michael S. Branicky, Sep 11 2021

Crossrefs

Cf. A000027.

Cf. A044873, A044874, A044875, A044876, A044877, A044878, A044879.

Cf. A044880, A044882, A044883, A044884, A044885, A044886, A044887.

Sequence in context: A282955 A282985 A262859 * A291269 A317291 A362921

Adjacent sequences: A044878 A044879 A044880 * A044882 A044883 A044884

Keyword

nonn,base

Author

Clark Kimberling

Status

approved