A069623 - cp's OEIS frontend

A069623 Number of perfect powers <= n.

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

[1, 1, 1, 2, 2, 2, 2, 3, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12]

cp's OEIS Frontend

A069623 Number of perfect powers <= n.

Table of values

List of values

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

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

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