A033002 Every run of digits of n in base 4 has length 2.

5, 10, 15, 80, 90, 95, 160, 165, 175, 240, 245, 250, 1285, 1290, 1295, 1440, 1445, 1455, 1520, 1525, 1530, 2565, 2570, 2575, 2640, 2650, 2655, 2800, 2805, 2810, 3845, 3850, 3855, 3920, 3930, 3935, 4000, 4005, 4015, 20560

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Comments

See A043291 and A033001 through A033014 for the analog in other bases, A033015 - A033029 for the variants with run lengths >= 2. - M. F. Hasler, Feb 04 2014

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..600

Programs

Mathematica

Select[Range[10000], Union[Length/@Split[IntegerDigits[#, 4]]]=={2}&] (* Vincenzo Librandi, Feb 05 2014 *)

Formula

a(n) = 5*A043308(n) (= 5*n for n<4). - M. F. Hasler, Feb 04 2014