A105561 - cp's OEIS frontend

A105561 a(n) is the m-th prime, where m is the number of distinct prime factors of n (A001221), a(1) = 1.

n	a(n)
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	2
10	3
11	2
12	3
13	2
14	3
15	3
16	2
17	2
18	3
19	2
20	3
21	3
22	3
23	2
24	3
25	2
26	3
27	2
28	3
29	2
30	5
31	2
32	2
33	3
34	3
35	3
36	3
37	2
38	3
39	3
40	3
41	2
42	5
43	2
44	3
45	3
46	3
47	2
48	3
49	2
50	3
51	3
52	3
53	2
54	3
55	3
56	3
57	3
58	3
59	2
60	5
61	2
62	3
63	3
64	2
65	3
66	5
67	2
68	3
69	3
70	5
71	2
72	3
73	2
74	3
75	3
76	3
77	3
78	5
79	2
80	3
81	2
82	3
83	2
84	5
85	3
86	3
87	3
88	3
89	2
90	5
91	3
92	3
93	3
94	3
95	3
96	3
97	2
98	3
99	3
100	3
101	2
102	5
103	2
104	3
105	5
106	3
107	2
108	3
109	2
110	5
111	3
112	3
113	2
114	5
115	3
116	3
117	3
118	3
119	3
120	5

[1, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 3, 3, 2, 2, 3, 2, 3, 3, 3, 2, 3, 2, 3, 2, 3, 2, 5, 2, 2, 3, 3, 3, 3, 2, 3, 3, 3, 2, 5, 2, 3, 3, 3, 2, 3, 2, 3, 3, 3, 2, 3, 3, 3, 3, 3, 2, 5, 2, 3, 3, 2, 3, 5, 2, 3, 3, 5, 2, 3, 2, 3, 3, 3, 3, 5, 2, 3, 2, 3, 2, 5, 3, 3, 3, 3, 2, 5, 3, 3, 3, 3, 3, 3, 2, 3, 3, 3, 2, 5, 2, 3, 5, 3, 2, 3, 2, 5, 3, 3, 2, 5, 3, 3, 3, 3, 3, 5]

cp's OEIS Frontend

A105561 a(n) is the m-th prime, where m is the number of distinct prime factors of n (A001221), a(1) = 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	2
10	3
11	2
12	3
13	2
14	3
15	3
16	2
17	2
18	3
19	2
20	3
21	3
22	3
23	2
24	3
25	2
26	3
27	2
28	3
29	2
30	5
31	2
32	2
33	3
34	3
35	3
36	3
37	2
38	3
39	3
40	3
41	2
42	5
43	2
44	3
45	3
46	3
47	2
48	3
49	2
50	3
51	3
52	3
53	2
54	3
55	3
56	3
57	3
58	3
59	2
60	5
61	2
62	3
63	3
64	2
65	3
66	5
67	2
68	3
69	3
70	5
71	2
72	3
73	2
74	3
75	3
76	3
77	3
78	5
79	2
80	3
81	2
82	3
83	2
84	5
85	3
86	3
87	3
88	3
89	2
90	5
91	3
92	3
93	3
94	3
95	3
96	3
97	2
98	3
99	3
100	3
101	2
102	5
103	2
104	3
105	5
106	3
107	2
108	3
109	2
110	5
111	3
112	3
113	2
114	5
115	3
116	3
117	3
118	3
119	3
120	5

n	a(n)
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	2
10	3
11	2
12	3
13	2
14	3
15	3
16	2
17	2
18	3
19	2
20	3
21	3
22	3
23	2
24	3
25	2
26	3
27	2
28	3
29	2
30	5
31	2
32	2
33	3
34	3
35	3
36	3
37	2
38	3
39	3
40	3
41	2
42	5
43	2
44	3
45	3
46	3
47	2
48	3
49	2
50	3
51	3
52	3
53	2
54	3
55	3
56	3
57	3
58	3
59	2
60	5
61	2
62	3
63	3
64	2
65	3
66	5
67	2
68	3
69	3
70	5
71	2
72	3
73	2
74	3
75	3
76	3
77	3
78	5
79	2
80	3
81	2
82	3
83	2
84	5
85	3
86	3
87	3
88	3
89	2
90	5
91	3
92	3
93	3
94	3
95	3
96	3
97	2
98	3
99	3
100	3
101	2
102	5
103	2
104	3
105	5
106	3
107	2
108	3
109	2
110	5
111	3
112	3
113	2
114	5
115	3
116	3
117	3
118	3
119	3
120	5

n	a(n)
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	2
10	3
11	2
12	3
13	2
14	3
15	3
16	2
17	2
18	3
19	2
20	3
21	3
22	3
23	2
24	3
25	2
26	3
27	2
28	3
29	2
30	5
31	2
32	2
33	3
34	3
35	3
36	3
37	2
38	3
39	3
40	3
41	2
42	5
43	2
44	3
45	3
46	3
47	2
48	3
49	2
50	3
51	3
52	3
53	2
54	3
55	3
56	3
57	3
58	3
59	2
60	5
61	2
62	3
63	3
64	2
65	3
66	5
67	2
68	3
69	3
70	5
71	2
72	3
73	2
74	3
75	3
76	3
77	3
78	5
79	2
80	3
81	2
82	3
83	2
84	5
85	3
86	3
87	3
88	3
89	2
90	5
91	3
92	3
93	3
94	3
95	3
96	3
97	2
98	3
99	3
100	3
101	2
102	5
103	2
104	3
105	5
106	3
107	2
108	3
109	2
110	5
111	3
112	3
113	2
114	5
115	3
116	3
117	3
118	3
119	3
120	5