A384054 - cp's OEIS frontend

A384054 The number of integers k from 1 to n such that the greatest divisor of k that is a unitary divisor of n is an exponentially odd number.

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

[1, 2, 3, 3, 5, 6, 7, 8, 8, 10, 11, 9, 13, 14, 15, 15, 17, 16, 19, 15, 21, 22, 23, 24, 24, 26, 27, 21, 29, 30, 31, 32, 33, 34, 35, 24, 37, 38, 39, 40, 41, 42, 43, 33, 40, 46, 47, 45, 48, 48, 51, 39, 53, 54, 55, 56, 57, 58, 59, 45, 61, 62, 56, 63, 65, 66, 67, 51]

cp's OEIS Frontend

A384054 The number of integers k from 1 to n such that the greatest divisor of k that is a unitary divisor of n is an exponentially odd number.

Table of values

List of values

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

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

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