A073893 - cp's OEIS frontend

A073893 a(10k) = 0 and if n is not a multiple of 10 then a(n) is the smallest positive integer such that the concatenation of the first n terms is a multiple of n.

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	5
8	6
9	1
10	0
11	8
12	4
13	9
14	4
15	5
16	6
17	25
18	2
19	15
20	0
21	15
22	10
23	28
24	16
25	25
26	16
27	28
28	16
29	13
30	0
31	14
32	4
33	22
34	36
35	5
36	16
37	35
38	14
39	47
40	0
41	16
42	8
43	42
44	28
45	35
46	18
47	49
48	44
49	27
50	0
51	42
52	4
53	26
54	6
55	45
56	52
57	53
58	38
59	62
60	0
61	44
62	50
63	25
64	28
65	15
66	32
67	43
68	72
69	29
70	0
71	61
72	44
73	45
74	8
75	25
76	56
77	82
78	84
79	85
80	0

[1, 2, 3, 2, 5, 2, 5, 6, 1, 0, 8, 4, 9, 4, 5, 6, 25, 2, 15, 0, 15, 10, 28, 16, 25, 16, 28, 16, 13, 0, 14, 4, 22, 36, 5, 16, 35, 14, 47, 0, 16, 8, 42, 28, 35, 18, 49, 44, 27, 0, 42, 4, 26, 6, 45, 52, 53, 38, 62, 0, 44, 50, 25, 28, 15, 32, 43, 72, 29, 0, 61, 44, 45, 8, 25, 56, 82, 84, 85, 0]

cp's OEIS Frontend

A073893 a(10k) = 0 and if n is not a multiple of 10 then a(n) is the smallest positive integer such that the concatenation of the first n terms is a multiple of n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	5
8	6
9	1
10	0
11	8
12	4
13	9
14	4
15	5
16	6
17	25
18	2
19	15
20	0
21	15
22	10
23	28
24	16
25	25
26	16
27	28
28	16
29	13
30	0
31	14
32	4
33	22
34	36
35	5
36	16
37	35
38	14
39	47
40	0
41	16
42	8
43	42
44	28
45	35
46	18
47	49
48	44
49	27
50	0
51	42
52	4
53	26
54	6
55	45
56	52
57	53
58	38
59	62
60	0
61	44
62	50
63	25
64	28
65	15
66	32
67	43
68	72
69	29
70	0
71	61
72	44
73	45
74	8
75	25
76	56
77	82
78	84
79	85
80	0

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	5
8	6
9	1
10	0
11	8
12	4
13	9
14	4
15	5
16	6
17	25
18	2
19	15
20	0
21	15
22	10
23	28
24	16
25	25
26	16
27	28
28	16
29	13
30	0
31	14
32	4
33	22
34	36
35	5
36	16
37	35
38	14
39	47
40	0
41	16
42	8
43	42
44	28
45	35
46	18
47	49
48	44
49	27
50	0
51	42
52	4
53	26
54	6
55	45
56	52
57	53
58	38
59	62
60	0
61	44
62	50
63	25
64	28
65	15
66	32
67	43
68	72
69	29
70	0
71	61
72	44
73	45
74	8
75	25
76	56
77	82
78	84
79	85
80	0

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	5
8	6
9	1
10	0
11	8
12	4
13	9
14	4
15	5
16	6
17	25
18	2
19	15
20	0
21	15
22	10
23	28
24	16
25	25
26	16
27	28
28	16
29	13
30	0
31	14
32	4
33	22
34	36
35	5
36	16
37	35
38	14
39	47
40	0
41	16
42	8
43	42
44	28
45	35
46	18
47	49
48	44
49	27
50	0
51	42
52	4
53	26
54	6
55	45
56	52
57	53
58	38
59	62
60	0
61	44
62	50
63	25
64	28
65	15
66	32
67	43
68	72
69	29
70	0
71	61
72	44
73	45
74	8
75	25
76	56
77	82
78	84
79	85
80	0