A357930 - cp's OEIS frontend

A357930 a(0) = 0; for n > 0, let S = concatenation of a(0)..a(n-1); a(n) is the number of times the digit at a(n-1) digits back from the end of S appears in S.

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	4
15	5
16	5
17	5
18	5
19	5
20	5
21	6
22	6
23	6
24	6
25	6
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	8
37	8
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	9
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	10
56	10
57	10
58	10
59	10
60	10
61	7
62	7
63	8
64	8
65	7
66	7
67	8
68	8
69	7
70	13
71	7
72	14
73	7
74	13
75	13
76	15
77	15
78	13
79	15
80	15
81	6
82	17
83	16
84	19
85	8
86	10
87	10
88	22
89	10
90	23

[0, 1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 7, 7, 8, 8, 7, 7, 8, 8, 7, 13, 7, 14, 7, 13, 13, 15, 15, 13, 15, 15, 6, 17, 16, 19, 8, 10, 10, 22, 10, 23]

cp's OEIS Frontend

A357930 a(0) = 0; for n > 0, let S = concatenation of a(0)..a(n-1); a(n) is the number of times the digit at a(n-1) digits back from the end of S appears in S.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	4
15	5
16	5
17	5
18	5
19	5
20	5
21	6
22	6
23	6
24	6
25	6
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	8
37	8
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	9
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	10
56	10
57	10
58	10
59	10
60	10
61	7
62	7
63	8
64	8
65	7
66	7
67	8
68	8
69	7
70	13
71	7
72	14
73	7
74	13
75	13
76	15
77	15
78	13
79	15
80	15
81	6
82	17
83	16
84	19
85	8
86	10
87	10
88	22
89	10
90	23

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	4
15	5
16	5
17	5
18	5
19	5
20	5
21	6
22	6
23	6
24	6
25	6
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	8
37	8
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	9
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	10
56	10
57	10
58	10
59	10
60	10
61	7
62	7
63	8
64	8
65	7
66	7
67	8
68	8
69	7
70	13
71	7
72	14
73	7
74	13
75	13
76	15
77	15
78	13
79	15
80	15
81	6
82	17
83	16
84	19
85	8
86	10
87	10
88	22
89	10
90	23

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	4
15	5
16	5
17	5
18	5
19	5
20	5
21	6
22	6
23	6
24	6
25	6
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	8
37	8
38	8
39	8
40	8
41	8
42	8
43	8
44	8
45	9
46	9
47	9
48	9
49	9
50	9
51	9
52	9
53	9
54	9
55	10
56	10
57	10
58	10
59	10
60	10
61	7
62	7
63	8
64	8
65	7
66	7
67	8
68	8
69	7
70	13
71	7
72	14
73	7
74	13
75	13
76	15
77	15
78	13
79	15
80	15
81	6
82	17
83	16
84	19
85	8
86	10
87	10
88	22
89	10
90	23