A216478 - cp's OEIS frontend

A216478 a(n) is the least multiple of n which uses only digits 1 and 2. a(n) = -1 if no such multiple exists.

n	a(n)
1	1
2	2
3	12
4	12
5	-1
6	12
7	21
8	112
9	12222
10	-1
11	11
12	12
13	221
14	112
15	-1
16	112
17	221
18	12222
19	1121
20	-1
21	21
22	22
23	12121
24	2112
25	-1
26	1222
27	21222
28	112
29	12122
30	-1
31	11222
32	2112
33	1122
34	1122
35	-1
36	22212
37	111
38	12122
39	111111
40	-1
41	11111
42	12222
43	12212
44	2112
45	-1
46	122222
47	1222
48	2112
49	11221
50	-1
51	1122
52	21112
53	212
54	21222
55	-1
56	112
57	212211
58	12122
59	1121

[1, 2, 12, 12, -1, 12, 21, 112, 12222, -1, 11, 12, 221, 112, -1, 112, 221, 12222, 1121, -1, 21, 22, 12121, 2112, -1, 1222, 21222, 112, 12122, -1, 11222, 2112, 1122, 1122, -1, 22212, 111, 12122, 111111, -1, 11111, 12222, 12212, 2112, -1, 122222, 1222, 2112, 11221, -1, 1122, 21112, 212, 21222, -1, 112, 212211, 12122, 1121]

cp's OEIS Frontend

A216478 a(n) is the least multiple of n which uses only digits 1 and 2. a(n) = -1 if no such multiple exists.

Table of values

List of values