A043091 Every string of 2 consecutive base 5 digits contains exactly 2 distinct numbers.

0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 26, 27, 28, 29, 35, 36, 38, 39, 40, 41, 42, 44, 45, 46, 47, 48, 51, 52, 53, 54, 55, 57, 58, 59, 65, 66, 67, 69, 70, 71, 72, 73, 76, 77, 78, 79, 80, 82, 83, 84, 85, 86

Offset: 0

Author

Clark Kimberling

Keywords

• nonn
• base

Programs

Mathematica

Select[Range[0,100],FreeQ[Differences[IntegerDigits[#,5]],0]&] (* Harvey P. Dale, Apr 04 2015 *)

Formula

A031943 UNION {0}. [From R. J. Mathar, Oct 20 2008]