A043093 Every string of 2 consecutive base 7 digits contains exactly 2 distinct numbers.

0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 50, 51, 52, 53, 54, 55, 63, 64, 66, 67, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78

Offset: 0

Author

Clark Kimberling

Keywords

• nonn
• base

Crossrefs

Cf. A000975 (base-2 analog), A031941 or A043089 (base-3 analog), A031942 or A043090 (base-4 analog), A031943 or A043091 (base-5 analog), A043092, ..., A043096 (base-6 through base-10 analog).