A358921 - cp's OEIS frontend

A358921 a(1) = 1; a(n) is the smallest positive number not among the terms a(n-c .. n-1) where c = the number of times a(n-1) has occurred.

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

[1, 2, 1, 3, 1, 2, 3, 1, 4, 1, 5, 1, 2, 3, 4, 1, 6, 1, 7, 1, 5, 2, 3, 4, 1, 8, 1, 9, 1, 6, 2, 3, 4, 1, 5, 2, 6, 1, 7, 2, 3, 4, 5, 1, 8, 2, 6, 3, 7, 1, 9, 2, 4, 5, 3, 6, 1, 10, 1, 11, 1, 12, 1, 13, 1, 14, 1, 8, 2, 3, 4, 5, 6, 1, 7, 2, 9, 1, 15, 1, 16, 1, 17, 1]

cp's OEIS Frontend

A358921 a(1) = 1; a(n) is the smallest positive number not among the terms a(n-c .. n-1) where c = the number of times a(n-1) has occurred.

Table of values

List of values

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

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

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