A336528 - cp's OEIS frontend

A336528 a(1) = 1; a(2) = 2; for n > 2, a(n) is the least number > a(n-1) whose decimal representation is uniquely the concatenation of the decimal representations of two distinct earlier terms.

n	a(n)
1	1
2	2
3	12
4	21
5	112
6	122
7	211
8	221
9	1112
10	1121
11	1211
12	1222
13	2111
14	2122
15	2212
16	2221
17	11112
18	11122
19	11221
20	11222
21	12211
22	12222
23	21111
24	21122
25	22111
26	22112
27	22211
28	22221
29	111112
30	111121
31	111212
32	112112
33	112121
34	112122
35	112212
36	121111
37	121122
38	121211
39	121222
40	122122

[1, 2, 12, 21, 112, 122, 211, 221, 1112, 1121, 1211, 1222, 2111, 2122, 2212, 2221, 11112, 11122, 11221, 11222, 12211, 12222, 21111, 21122, 22111, 22112, 22211, 22221, 111112, 111121, 111212, 112112, 112121, 112122, 112212, 121111, 121122, 121211, 121222, 122122]

cp's OEIS Frontend

A336528 a(1) = 1; a(2) = 2; for n > 2, a(n) is the least number > a(n-1) whose decimal representation is uniquely the concatenation of the decimal representations of two distinct earlier terms.

Table of values

List of values