A033017 Numbers whose base-4 expansion has no run of digits with length < 2.

5, 10, 15, 21, 42, 63, 80, 85, 90, 95, 160, 165, 170, 175, 240, 245, 250, 255, 320, 336, 341, 346, 351, 362, 383, 640, 661, 672, 677, 682, 687, 703, 960, 981, 1002, 1008, 1013, 1018, 1023, 1280, 1285, 1290, 1295, 1344, 1360, 1365

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1600

Crossrefs

Cf. A007090. Supersequence of A033002.

Programs

Mathematica

Select[Range[1400],Min[Length/@Split[IntegerDigits[#,4]]]>1&] (* Harvey P. Dale, Jun 05 2013 *)