A216482 - cp's OEIS frontend

A216482 a(n) is the least value of k such that k*n uses only digits 1 and 2. a(n) = -1 if no such multiple exists.

n	a(n)
1	1
2	1
3	4
4	3
5	-1
6	2
7	3
8	14
9	1358
10	-1
11	1
12	1
13	17
14	8
15	-1
16	7
17	13
18	679
19	59
20	-1
21	1
22	1
23	527
24	88
25	-1
26	47
27	786
28	4
29	418
30	-1
31	362
32	66
33	34
34	33
35	-1
36	617
37	3
38	319
39	2849
40	-1
41	271
42	291
43	284
44	48
45	-1
46	2657
47	26
48	44
49	229
50	-1
51	22
52	406
53	4
54	393
55	-1
56	2
57	3723
58	209
59	19
60	-1
61	2
62	181
63	194
64	33
65	-1
66	17
67	33
68	1634
69	3219
70	-1
71	172
72	1696
73	2907
74	3
75	-1
76	1462
77	1443
78	1554
79	28
80	-1
81	262
82	271
83	134
84	1443

[1, 1, 4, 3, -1, 2, 3, 14, 1358, -1, 1, 1, 17, 8, -1, 7, 13, 679, 59, -1, 1, 1, 527, 88, -1, 47, 786, 4, 418, -1, 362, 66, 34, 33, -1, 617, 3, 319, 2849, -1, 271, 291, 284, 48, -1, 2657, 26, 44, 229, -1, 22, 406, 4, 393, -1, 2, 3723, 209, 19, -1, 2, 181, 194, 33, -1, 17, 33, 1634, 3219, -1, 172, 1696, 2907, 3, -1, 1462, 1443, 1554, 28, -1, 262, 271, 134, 1443]

cp's OEIS Frontend

A216482 a(n) is the least value of k such that k*n uses only digits 1 and 2. a(n) = -1 if no such multiple exists.

Table of values

List of values