A385195 - cp's OEIS frontend

A385195 The number of integers k from 1 to n such that the greatest divisor of k that is a unitary divisor of n is either 1 or 2.

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

[1, 2, 2, 3, 4, 4, 6, 7, 8, 8, 10, 6, 12, 12, 8, 15, 16, 16, 18, 12, 12, 20, 22, 14, 24, 24, 26, 18, 28, 16, 30, 31, 20, 32, 24, 24, 36, 36, 24, 28, 40, 24, 42, 30, 32, 44, 46, 30, 48, 48, 32, 36, 52, 52, 40, 42, 36, 56, 58, 24, 60, 60, 48, 63, 48, 40, 66, 48, 44]

cp's OEIS Frontend

A385195 The number of integers k from 1 to n such that the greatest divisor of k that is a unitary divisor of n is either 1 or 2.

Table of values

List of values

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

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

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