A033005 Every run of digits of n in base 7 has length 2.

8, 16, 24, 32, 40, 48, 392, 408, 416, 424, 432, 440, 784, 792, 808, 816, 824, 832, 1176, 1184, 1192, 1208, 1216, 1224, 1568, 1576, 1584, 1592, 1608, 1616, 1960, 1968, 1976, 1984, 1992, 2008, 2352, 2360, 2368, 2376, 2384, 2392

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 02 2014

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1500

Programs

Mathematica

Select[Range[2500],Union[Length/@Split[IntegerDigits[#,7]]]=={2}&] (* Harvey P. Dale, Oct 24 2011 *)

Formula

a(n) = 8*A043311(n) (= 8*n for n<7). - M. F. Hasler, Feb 02 2014