A330015 - cp's OEIS frontend

A330015 a(0) = 0; for n > 0, a(n) is the number of distinct digit strings that occur at least twice (including any overlapping occurrences) in the concatenation of all previous terms.

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

[0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 12, 14, 14, 15, 17, 17, 18, 20, 20, 21, 24, 24, 25, 27, 27, 28, 30, 30, 31, 33, 34, 36, 36, 37, 39, 39, 40, 40, 41, 43, 45, 46, 46, 47, 49, 49, 51, 52, 54, 56, 57, 57, 58, 60, 60, 61, 63, 63, 65, 67, 68, 68, 70, 70, 71, 73, 75]

cp's OEIS Frontend

A330015 a(0) = 0; for n > 0, a(n) is the number of distinct digit strings that occur at least twice (including any overlapping occurrences) in the concatenation of all previous terms.

Table of values

List of values

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

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

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