A288469 - cp's OEIS frontend

A288469 a(n) = n if n is a nonprime, otherwise take the prime index of n and repeat until you get a nonprime which is then a(n).

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

[1, 1, 1, 4, 1, 6, 4, 8, 9, 10, 1, 12, 6, 14, 15, 16, 4, 18, 8, 20, 21, 22, 9, 24, 25, 26, 27, 28, 10, 30, 1, 32, 33, 34, 35, 36, 12, 38, 39, 40, 6, 42, 14, 44, 45, 46, 15, 48, 49, 50, 51, 52, 16, 54, 55, 56, 57, 58, 4, 60, 18, 62, 63, 64, 65, 66, 8, 68, 69, 70, 20, 72, 21, 74, 75, 76, 77, 78, 22, 80, 81, 82, 9, 84, 85, 86]

cp's OEIS Frontend

A288469 a(n) = n if n is a nonprime, otherwise take the prime index of n and repeat until you get a nonprime which is then a(n).

Table of values

List of values

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

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

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