A127421 - cp's OEIS frontend

A127421 Numbers whose decimal expansion is a concatenation of 2 consecutive increasing nonnegative numbers.

n	a(n)
1	1
2	12
3	23
4	34
5	45
6	56
7	67
8	78
9	89
10	910
11	1011
12	1112
13	1213
14	1314
15	1415
16	1516
17	1617
18	1718
19	1819
20	1920
21	2021
22	2122
23	2223
24	2324
25	2425
26	2526
27	2627
28	2728
29	2829
30	2930
31	3031
32	3132
33	3233
34	3334
35	3435
36	3536
37	3637
38	3738
39	3839
40	3940
41	4041
42	4142
43	4243
44	4344
45	4445
46	4546

[1, 12, 23, 34, 45, 56, 67, 78, 89, 910, 1011, 1112, 1213, 1314, 1415, 1516, 1617, 1718, 1819, 1920, 2021, 2122, 2223, 2324, 2425, 2526, 2627, 2728, 2829, 2930, 3031, 3132, 3233, 3334, 3435, 3536, 3637, 3738, 3839, 3940, 4041, 4142, 4243, 4344, 4445, 4546]

cp's OEIS Frontend

A127421 Numbers whose decimal expansion is a concatenation of 2 consecutive increasing nonnegative numbers.

Table of values

List of values