A008334 - cp's OEIS frontend

A008334 Number of distinct primes dividing p-1, where p = n-th prime.

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	2
9	2
10	2
11	3
12	2
13	2
14	3
15	2
16	2
17	2
18	3
19	3
20	3
21	2
22	3
23	2
24	2
25	2
26	2
27	3
28	2
29	2
30	2
31	3
32	3
33	2
34	3
35	2
36	3
37	3
38	2
39	2
40	2
41	2
42	3
43	3
44	2
45	2
46	3
47	4
48	3
49	2
50	3
51	2
52	3
53	3
54	2
55	1
56	2
57	2
58	3
59	3
60	3
61	3
62	2
63	3
64	3
65	3
66	2
67	4
68	3
69	2
70	3
71	2
72	2
73	3
74	3
75	3
76	2
77	2
78	3
79	2
80	3
81	3
82	4
83	3
84	2
85	3
86	3
87	2
88	3
89	3
90	4
91	2
92	2
93	2
94	3
95	3

[0, 1, 1, 2, 2, 2, 1, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 3, 3, 3, 2, 3, 2, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 2, 3, 3, 2, 2, 2, 2, 3, 3, 2, 2, 3, 4, 3, 2, 3, 2, 3, 3, 2, 1, 2, 2, 3, 3, 3, 3, 2, 3, 3, 3, 2, 4, 3, 2, 3, 2, 2, 3, 3, 3, 2, 2, 3, 2, 3, 3, 4, 3, 2, 3, 3, 2, 3, 3, 4, 2, 2, 2, 3, 3]

cp's OEIS Frontend

A008334 Number of distinct primes dividing p-1, where p = n-th prime.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	2
9	2
10	2
11	3
12	2
13	2
14	3
15	2
16	2
17	2
18	3
19	3
20	3
21	2
22	3
23	2
24	2
25	2
26	2
27	3
28	2
29	2
30	2
31	3
32	3
33	2
34	3
35	2
36	3
37	3
38	2
39	2
40	2
41	2
42	3
43	3
44	2
45	2
46	3
47	4
48	3
49	2
50	3
51	2
52	3
53	3
54	2
55	1
56	2
57	2
58	3
59	3
60	3
61	3
62	2
63	3
64	3
65	3
66	2
67	4
68	3
69	2
70	3
71	2
72	2
73	3
74	3
75	3
76	2
77	2
78	3
79	2
80	3
81	3
82	4
83	3
84	2
85	3
86	3
87	2
88	3
89	3
90	4
91	2
92	2
93	2
94	3
95	3

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	2
9	2
10	2
11	3
12	2
13	2
14	3
15	2
16	2
17	2
18	3
19	3
20	3
21	2
22	3
23	2
24	2
25	2
26	2
27	3
28	2
29	2
30	2
31	3
32	3
33	2
34	3
35	2
36	3
37	3
38	2
39	2
40	2
41	2
42	3
43	3
44	2
45	2
46	3
47	4
48	3
49	2
50	3
51	2
52	3
53	3
54	2
55	1
56	2
57	2
58	3
59	3
60	3
61	3
62	2
63	3
64	3
65	3
66	2
67	4
68	3
69	2
70	3
71	2
72	2
73	3
74	3
75	3
76	2
77	2
78	3
79	2
80	3
81	3
82	4
83	3
84	2
85	3
86	3
87	2
88	3
89	3
90	4
91	2
92	2
93	2
94	3
95	3

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	2
9	2
10	2
11	3
12	2
13	2
14	3
15	2
16	2
17	2
18	3
19	3
20	3
21	2
22	3
23	2
24	2
25	2
26	2
27	3
28	2
29	2
30	2
31	3
32	3
33	2
34	3
35	2
36	3
37	3
38	2
39	2
40	2
41	2
42	3
43	3
44	2
45	2
46	3
47	4
48	3
49	2
50	3
51	2
52	3
53	3
54	2
55	1
56	2
57	2
58	3
59	3
60	3
61	3
62	2
63	3
64	3
65	3
66	2
67	4
68	3
69	2
70	3
71	2
72	2
73	3
74	3
75	3
76	2
77	2
78	3
79	2
80	3
81	3
82	4
83	3
84	2
85	3
86	3
87	2
88	3
89	3
90	4
91	2
92	2
93	2
94	3
95	3