A173883 - cp's OEIS frontend

A173883 a(n) = number of iterations in the sequence of classes of prime numbers for prime(n).

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	1
8	1
9	2
10	2
11	2
12	3
13	2
14	2
15	3
16	2
17	2
18	2
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	3
30	4
31	4
32	4
33	4
34	5
35	4
36	4
37	4
38	4
39	4
40	4
41	4
42	4
43	4
44	4
45	4
46	4
47	4
48	8
49	8
50	8
51	8
52	6
53	5
54	4
55	4
56	4
57	4
58	4
59	6
60	4
61	5
62	4
63	5
64	4
65	5
66	5
67	4
68	4
69	4
70	4
71	5
72	6
73	5
74	4
75	6
76	4
77	4
78	4
79	4
80	4
81	4
82	4
83	8
84	8
85	8
86	8
87	8
88	8
89	8

[0, 0, 0, 0, 0, 1, 1, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 6, 5, 4, 4, 4, 4, 4, 6, 4, 5, 4, 5, 4, 5, 5, 4, 4, 4, 4, 5, 6, 5, 4, 6, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8]

cp's OEIS Frontend

A173883 a(n) = number of iterations in the sequence of classes of prime numbers for prime(n).

Table of values

List of values

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	1
8	1
9	2
10	2
11	2
12	3
13	2
14	2
15	3
16	2
17	2
18	2
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	3
30	4
31	4
32	4
33	4
34	5
35	4
36	4
37	4
38	4
39	4
40	4
41	4
42	4
43	4
44	4
45	4
46	4
47	4
48	8
49	8
50	8
51	8
52	6
53	5
54	4
55	4
56	4
57	4
58	4
59	6
60	4
61	5
62	4
63	5
64	4
65	5
66	5
67	4
68	4
69	4
70	4
71	5
72	6
73	5
74	4
75	6
76	4
77	4
78	4
79	4
80	4
81	4
82	4
83	8
84	8
85	8
86	8
87	8
88	8
89	8

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	1
8	1
9	2
10	2
11	2
12	3
13	2
14	2
15	3
16	2
17	2
18	2
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	3
30	4
31	4
32	4
33	4
34	5
35	4
36	4
37	4
38	4
39	4
40	4
41	4
42	4
43	4
44	4
45	4
46	4
47	4
48	8
49	8
50	8
51	8
52	6
53	5
54	4
55	4
56	4
57	4
58	4
59	6
60	4
61	5
62	4
63	5
64	4
65	5
66	5
67	4
68	4
69	4
70	4
71	5
72	6
73	5
74	4
75	6
76	4
77	4
78	4
79	4
80	4
81	4
82	4
83	8
84	8
85	8
86	8
87	8
88	8
89	8

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	1
8	1
9	2
10	2
11	2
12	3
13	2
14	2
15	3
16	2
17	2
18	2
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	3
30	4
31	4
32	4
33	4
34	5
35	4
36	4
37	4
38	4
39	4
40	4
41	4
42	4
43	4
44	4
45	4
46	4
47	4
48	8
49	8
50	8
51	8
52	6
53	5
54	4
55	4
56	4
57	4
58	4
59	6
60	4
61	5
62	4
63	5
64	4
65	5
66	5
67	4
68	4
69	4
70	4
71	5
72	6
73	5
74	4
75	6
76	4
77	4
78	4
79	4
80	4
81	4
82	4
83	8
84	8
85	8
86	8
87	8
88	8
89	8