A328018 - cp's OEIS frontend

A328018 If n is the k-th number divisible by 7 or containing a digit 7 (in base 10) then a(n) = a(k) otherwise a(n) = n.

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

[1, 2, 3, 4, 5, 6, 1, 8, 9, 10, 11, 12, 13, 2, 15, 16, 3, 18, 19, 20, 4, 22, 23, 24, 25, 26, 5, 6, 29, 30, 31, 32, 33, 34, 1, 36, 8, 38, 39, 40, 41, 9, 43, 44, 45, 46, 10, 48, 11, 50, 51, 52, 53, 54, 55, 12, 13, 58, 59, 60, 61, 62, 2, 64, 65, 66, 15, 68, 69, 16, 3]

cp's OEIS Frontend

A328018 If n is the k-th number divisible by 7 or containing a digit 7 (in base 10) then a(n) = a(k) otherwise a(n) = n.

Table of values

List of values

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

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

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