A361172 - cp's OEIS frontend

A361172 a(n) is the smallest positive number not among the terms between a(n-1) and the previous most recent occurrence of a(n-1) inclusive; if a(n-1) is a first occurrence, set a(n)=1; a(1)=1.

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

[1, 1, 2, 1, 3, 1, 2, 4, 1, 3, 5, 1, 2, 6, 1, 3, 4, 7, 1, 2, 5, 8, 1, 3, 6, 9, 1, 2, 4, 10, 1, 3, 5, 7, 11, 1, 2, 6, 8, 12, 1, 3, 4, 9, 13, 1, 2, 5, 10, 14, 1, 3, 6, 7, 15, 1, 2, 4, 8, 11, 16, 1, 3, 5, 9, 12, 17, 1, 2, 6, 10, 13, 18, 1, 3, 4, 7, 14, 19, 1, 2, 5, 8, 15, 20, 1]

cp's OEIS Frontend

A361172 a(n) is the smallest positive number not among the terms between a(n-1) and the previous most recent occurrence of a(n-1) inclusive; if a(n-1) is a first occurrence, set a(n)=1; a(1)=1.

Table of values

List of values

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

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

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