A044871 Positive integers having the same number of base-15 runs of odd length as even.

225, 240, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 257, 273, 289, 305, 321, 337, 353, 369, 385, 401, 417, 433, 449, 450, 466, 480, 481, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 498

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..10500

Example

225 = (1,0,0)_15 is in the sequence because it has 1 run of length 2 and also one run of length 1. - R. J. Mathar, May 22 2026

Mathematica

b15rQ[n_]:=Module[{r=Length/@Split[IntegerDigits[n, 15]]}, Count[r, _?OddQ]==Length[r]/2]; Select[Range[8000], b15rQ] (* Vincenzo Librandi, Jan 18 2017 *)

Crossrefs

Cf. A044841 (more runs of even length), A043704 (even number of runs).

Sequence in context: A247885 A345552 A345806 * A202005 A386640 A395013

Adjacent sequences: A044868 A044869 A044870 * A044872 A044873 A044874

Keyword

nonn,base

Author

Clark Kimberling

Status

approved