A278029 - cp's OEIS frontend

A278029 a(1) = 0; for n > 1, a(n) = k if n is a non-perfect-power, A007916(k); or 0 if n is a perfect power.

n	a(n)
1	0
2	1
3	2
4	0
5	3
6	4
7	5
8	0
9	0
10	6
11	7
12	8
13	9
14	10
15	11
16	0
17	12
18	13
19	14
20	15
21	16
22	17
23	18
24	19
25	0
26	20
27	0
28	21
29	22
30	23
31	24
32	0
33	25
34	26
35	27
36	0
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	0
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	0
65	54
66	55
67	56
68	57
69	58
70	59
71	60
72	61
73	62
74	63
75	64
76	65
77	66
78	67
79	68
80	69
81	0

[0, 1, 2, 0, 3, 4, 5, 0, 0, 6, 7, 8, 9, 10, 11, 0, 12, 13, 14, 15, 16, 17, 18, 19, 0, 20, 0, 21, 22, 23, 24, 0, 25, 26, 27, 0, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 0, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 0, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 0]

cp's OEIS Frontend

A278029 a(1) = 0; for n > 1, a(n) = k if n is a non-perfect-power, A007916(k); or 0 if n is a perfect power.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	0
5	3
6	4
7	5
8	0
9	0
10	6
11	7
12	8
13	9
14	10
15	11
16	0
17	12
18	13
19	14
20	15
21	16
22	17
23	18
24	19
25	0
26	20
27	0
28	21
29	22
30	23
31	24
32	0
33	25
34	26
35	27
36	0
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	0
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	0
65	54
66	55
67	56
68	57
69	58
70	59
71	60
72	61
73	62
74	63
75	64
76	65
77	66
78	67
79	68
80	69
81	0

n	a(n)
1	0
2	1
3	2
4	0
5	3
6	4
7	5
8	0
9	0
10	6
11	7
12	8
13	9
14	10
15	11
16	0
17	12
18	13
19	14
20	15
21	16
22	17
23	18
24	19
25	0
26	20
27	0
28	21
29	22
30	23
31	24
32	0
33	25
34	26
35	27
36	0
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	0
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	0
65	54
66	55
67	56
68	57
69	58
70	59
71	60
72	61
73	62
74	63
75	64
76	65
77	66
78	67
79	68
80	69
81	0

n	a(n)
1	0
2	1
3	2
4	0
5	3
6	4
7	5
8	0
9	0
10	6
11	7
12	8
13	9
14	10
15	11
16	0
17	12
18	13
19	14
20	15
21	16
22	17
23	18
24	19
25	0
26	20
27	0
28	21
29	22
30	23
31	24
32	0
33	25
34	26
35	27
36	0
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	0
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	0
65	54
66	55
67	56
68	57
69	58
70	59
71	60
72	61
73	62
74	63
75	64
76	65
77	66
78	67
79	68
80	69
81	0