A381527 - cp's OEIS frontend

A381527 a(n) is the smallest positive multiple of n such that the decimal expansion of a(n)/n is a substring of the decimal expansion of a(n), or -1 if no such number exists.

n	a(n)
0	-1
1	1
2	-1
3	15
4	-1
5	25
6	12
7	35
8	-1
9	45
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	-1
21	21
22	198
23	115
24	1728
25	125
26	52
27	135
28	168
29	145
30	150
31	31
32	2912
33	165
34	1428
35	140
36	72
37	148
38	1368
39	195
40	-1
41	41
42	3948
43	215
44	132
45	135
46	92
47	235
48	384
49	245
50	250
51	51
52	1248
53	265
54	378
55	275

[-1, 1, -1, 15, -1, 25, 12, 35, -1, 45, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, -1, 21, 198, 115, 1728, 125, 52, 135, 168, 145, 150, 31, 2912, 165, 1428, 140, 72, 148, 1368, 195, -1, 41, 3948, 215, 132, 135, 92, 235, 384, 245, 250, 51, 1248, 265, 378, 275]

cp's OEIS Frontend

A381527 a(n) is the smallest positive multiple of n such that the decimal expansion of a(n)/n is a substring of the decimal expansion of a(n), or -1 if no such number exists.

Table of values

List of values