A339144 - cp's OEIS frontend

A339144 a(n) is the smallest positive integer such that n*a(n) contains n+a(n) as a substring. If no such number exists then a(n) = -1.

n	a(n)
1	-1
2	2
3	-1
4	68
5	-1
6	-1
7	-1
8	44
9	-1
10	890
11	110
12	60
13	44
14	35
15	30
16	27
17	25
18	23
19	22
20	20
21	929
22	19
23	18
24	88
25	17
26	-1
27	16
28	16
29	68
30	15
31	15
32	60
33	58
34	56
35	14
36	14
37	14
38	371
39	48
40	360
41	336
42	562
43	9104
44	8
45	13
46	13
47	283
48	39
49	269
50	450
51	37
52	452
53	245
54	18
55	679
56	34
57	225
58	33
59	2053
60	12
61	12
62	12
63	12
64	12
65	30
66	369
67	889
68	4
69	16961

[-1, 2, -1, 68, -1, -1, -1, 44, -1, 890, 110, 60, 44, 35, 30, 27, 25, 23, 22, 20, 929, 19, 18, 88, 17, -1, 16, 16, 68, 15, 15, 60, 58, 56, 14, 14, 14, 371, 48, 360, 336, 562, 9104, 8, 13, 13, 283, 39, 269, 450, 37, 452, 245, 18, 679, 34, 225, 33, 2053, 12, 12, 12, 12, 12, 30, 369, 889, 4, 16961]

cp's OEIS Frontend

A339144 a(n) is the smallest positive integer such that n*a(n) contains n+a(n) as a substring. If no such number exists then a(n) = -1.

Table of values

List of values