A239138 - cp's OEIS frontend

A239138 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive digits then we do not have d <= e > f, and S is always extended with the smallest integer not yet present in S.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	99
11	999
12	9999
13	99999
14	999999
15	9999999
16	99999999
17	999999999
18	9999999999
19	99999999999
20	999999999999
21	9999999999999
22	99999999999999
23	999999999999999
24	9999999999999999
25	99999999999999999
26	999999999999999999
27	9999999999999999999

[1, 2, 3, 4, 5, 6, 7, 8, 9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999, 9999999999, 99999999999, 999999999999, 9999999999999, 99999999999999, 999999999999999, 9999999999999999, 99999999999999999, 999999999999999999, 9999999999999999999]

cp's OEIS Frontend

A239138 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive digits then we do not have d <= e > f, and S is always extended with the smallest integer not yet present in S.

Table of values

List of values