A076398 - cp's OEIS frontend

A076398 Number of distinct prime factors of n-th perfect power.

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	2
18	1
19	2
20	2
21	2
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	2
30	2
31	1
32	1
33	2
34	1
35	2
36	1
37	2
38	1
39	3
40	1
41	2
42	1
43	2
44	2
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	1
53	2
54	3
55	1
56	2
57	2
58	1
59	2
60	1
61	1
62	1
63	2
64	1
65	2
66	2
67	2
68	2
69	1
70	2
71	2
72	1
73	2
74	2
75	2
76	2
77	1
78	3
79	1
80	2
81	2
82	1
83	2
84	3
85	1
86	2
87	2
88	3
89	1
90	1
91	2
92	1
93	2
94	2
95	2
96	2
97	2
98	3
99	1
100	2
101	1
102	2
103	1
104	1
105	3

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

cp's OEIS Frontend

A076398 Number of distinct prime factors of n-th perfect power.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	2
18	1
19	2
20	2
21	2
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	2
30	2
31	1
32	1
33	2
34	1
35	2
36	1
37	2
38	1
39	3
40	1
41	2
42	1
43	2
44	2
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	1
53	2
54	3
55	1
56	2
57	2
58	1
59	2
60	1
61	1
62	1
63	2
64	1
65	2
66	2
67	2
68	2
69	1
70	2
71	2
72	1
73	2
74	2
75	2
76	2
77	1
78	3
79	1
80	2
81	2
82	1
83	2
84	3
85	1
86	2
87	2
88	3
89	1
90	1
91	2
92	1
93	2
94	2
95	2
96	2
97	2
98	3
99	1
100	2
101	1
102	2
103	1
104	1
105	3

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	2
18	1
19	2
20	2
21	2
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	2
30	2
31	1
32	1
33	2
34	1
35	2
36	1
37	2
38	1
39	3
40	1
41	2
42	1
43	2
44	2
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	1
53	2
54	3
55	1
56	2
57	2
58	1
59	2
60	1
61	1
62	1
63	2
64	1
65	2
66	2
67	2
68	2
69	1
70	2
71	2
72	1
73	2
74	2
75	2
76	2
77	1
78	3
79	1
80	2
81	2
82	1
83	2
84	3
85	1
86	2
87	2
88	3
89	1
90	1
91	2
92	1
93	2
94	2
95	2
96	2
97	2
98	3
99	1
100	2
101	1
102	2
103	1
104	1
105	3

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	2
18	1
19	2
20	2
21	2
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	2
30	2
31	1
32	1
33	2
34	1
35	2
36	1
37	2
38	1
39	3
40	1
41	2
42	1
43	2
44	2
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	1
53	2
54	3
55	1
56	2
57	2
58	1
59	2
60	1
61	1
62	1
63	2
64	1
65	2
66	2
67	2
68	2
69	1
70	2
71	2
72	1
73	2
74	2
75	2
76	2
77	1
78	3
79	1
80	2
81	2
82	1
83	2
84	3
85	1
86	2
87	2
88	3
89	1
90	1
91	2
92	1
93	2
94	2
95	2
96	2
97	2
98	3
99	1
100	2
101	1
102	2
103	1
104	1
105	3