A161760 - OEIS

A161760 as a simple table

n	a(n)
1	4
2	6
3	8
4	9
5	12
6	34
7	45
8	56
9	78
10	90
11	123
12	234
13	345
14	456
15	567
16	678
17	789
18	890
19	901
20	1234
21	2345
22	3456
23	5678
24	6789
25	7890
26	8901
27	9012
28	12345
29	23456
30	34567
31	45678
32	56789
33	67890
34	89012
35	90123

[4,6,8,9,12,34,45,56,78,90,123,234,345,456,567, 678,789,890,901,1234,2345,3456,5678,6789,7890, 8901,9012,12345,23456,34567,45678,56789,67890, 89012,90123]