A289023 - cp's OEIS frontend

A289023 Position in the sequence of numbers that are not perfect powers (A007916) of the smallest positive integer x such that for some positive integer y we have n = x^y (A052410).

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

[1, 2, 1, 3, 4, 5, 1, 2, 6, 7, 8, 9, 10, 11, 1, 12, 13, 14, 15, 16, 17, 18, 19, 3, 20, 2, 21, 22, 23, 24, 1, 25, 26, 27, 4, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 5, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 1, 54, 55, 56, 57, 58, 59, 60]

cp's OEIS Frontend

A289023 Position in the sequence of numbers that are not perfect powers (A007916) of the smallest positive integer x such that for some positive integer y we have n = x^y (A052410).

Table of values

List of values

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

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

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