A363159 - cp's OEIS frontend

A363159 a(1)=1. Thereafter, if a(n-1) is a novel term, a(n) is the smallest prime which does not divide a(n-1). If a(n-1) has been seen k (>1) times already then a(n) = k*a(n-1).

n	a(n)
1	1
2	2
3	3
4	2
5	4
6	3
7	6
8	5
9	2
10	6
11	12
12	5
13	10
14	3
15	9
16	2
17	8
18	3
19	12
20	24
21	5
22	15
23	2
24	10
25	20
26	3
27	15
28	30
29	7
30	2
31	12
32	36
33	5
34	20
35	40
36	3
37	18
38	5
39	25
40	2
41	14
42	3
43	21
44	2
45	16
46	3
47	24
48	48
49	5
50	30
51	60
52	7
53	14
54	28
55	3
56	27
57	2
58	18
59	36
60	72
61	5
62	35
63	2
64	20
65	60
66	120
67	7
68	21
69	42
70	5
71	40
72	80
73	3
74	30
75	90
76	7
77	28
78	56
79	3
80	33
81	2
82	22
83	3
84	36
85	108

[1, 2, 3, 2, 4, 3, 6, 5, 2, 6, 12, 5, 10, 3, 9, 2, 8, 3, 12, 24, 5, 15, 2, 10, 20, 3, 15, 30, 7, 2, 12, 36, 5, 20, 40, 3, 18, 5, 25, 2, 14, 3, 21, 2, 16, 3, 24, 48, 5, 30, 60, 7, 14, 28, 3, 27, 2, 18, 36, 72, 5, 35, 2, 20, 60, 120, 7, 21, 42, 5, 40, 80, 3, 30, 90, 7, 28, 56, 3, 33, 2, 22, 3, 36, 108]

cp's OEIS Frontend

A363159 a(1)=1. Thereafter, if a(n-1) is a novel term, a(n) is the smallest prime which does not divide a(n-1). If a(n-1) has been seen k (>1) times already then a(n) = k*a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	2
5	4
6	3
7	6
8	5
9	2
10	6
11	12
12	5
13	10
14	3
15	9
16	2
17	8
18	3
19	12
20	24
21	5
22	15
23	2
24	10
25	20
26	3
27	15
28	30
29	7
30	2
31	12
32	36
33	5
34	20
35	40
36	3
37	18
38	5
39	25
40	2
41	14
42	3
43	21
44	2
45	16
46	3
47	24
48	48
49	5
50	30
51	60
52	7
53	14
54	28
55	3
56	27
57	2
58	18
59	36
60	72
61	5
62	35
63	2
64	20
65	60
66	120
67	7
68	21
69	42
70	5
71	40
72	80
73	3
74	30
75	90
76	7
77	28
78	56
79	3
80	33
81	2
82	22
83	3
84	36
85	108

n	a(n)
1	1
2	2
3	3
4	2
5	4
6	3
7	6
8	5
9	2
10	6
11	12
12	5
13	10
14	3
15	9
16	2
17	8
18	3
19	12
20	24
21	5
22	15
23	2
24	10
25	20
26	3
27	15
28	30
29	7
30	2
31	12
32	36
33	5
34	20
35	40
36	3
37	18
38	5
39	25
40	2
41	14
42	3
43	21
44	2
45	16
46	3
47	24
48	48
49	5
50	30
51	60
52	7
53	14
54	28
55	3
56	27
57	2
58	18
59	36
60	72
61	5
62	35
63	2
64	20
65	60
66	120
67	7
68	21
69	42
70	5
71	40
72	80
73	3
74	30
75	90
76	7
77	28
78	56
79	3
80	33
81	2
82	22
83	3
84	36
85	108

n	a(n)
1	1
2	2
3	3
4	2
5	4
6	3
7	6
8	5
9	2
10	6
11	12
12	5
13	10
14	3
15	9
16	2
17	8
18	3
19	12
20	24
21	5
22	15
23	2
24	10
25	20
26	3
27	15
28	30
29	7
30	2
31	12
32	36
33	5
34	20
35	40
36	3
37	18
38	5
39	25
40	2
41	14
42	3
43	21
44	2
45	16
46	3
47	24
48	48
49	5
50	30
51	60
52	7
53	14
54	28
55	3
56	27
57	2
58	18
59	36
60	72
61	5
62	35
63	2
64	20
65	60
66	120
67	7
68	21
69	42
70	5
71	40
72	80
73	3
74	30
75	90
76	7
77	28
78	56
79	3
80	33
81	2
82	22
83	3
84	36
85	108