A385196 - cp's OEIS frontend

A385196 The number of integers k from 1 to n such that the greatest divisor of k that is a unitary divisor of n is a prime number.

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	3
7	1
8	0
9	0
10	5
11	1
12	3
13	1
14	7
15	6
16	0
17	1
18	8
19	1
20	3
21	8
22	11
23	1
24	7
25	0
26	13
27	0
28	3
29	1
30	14
31	1
32	0
33	12
34	17
35	10
36	0
37	1
38	19
39	14
40	7
41	1
42	20
43	1
44	3
45	8
46	23
47	1
48	15
49	0
50	24
51	18
52	3
53	1
54	26
55	14
56	7
57	20
58	29
59	1
60	18
61	1
62	31
63	8
64	0
65	16
66	32
67	1
68	3
69	24
70	34
71	1
72	0
73	1
74	37
75	24
76	3
77	16
78	38

[0, 1, 1, 0, 1, 3, 1, 0, 0, 5, 1, 3, 1, 7, 6, 0, 1, 8, 1, 3, 8, 11, 1, 7, 0, 13, 0, 3, 1, 14, 1, 0, 12, 17, 10, 0, 1, 19, 14, 7, 1, 20, 1, 3, 8, 23, 1, 15, 0, 24, 18, 3, 1, 26, 14, 7, 20, 29, 1, 18, 1, 31, 8, 0, 16, 32, 1, 3, 24, 34, 1, 0, 1, 37, 24, 3, 16, 38]

cp's OEIS Frontend

A385196 The number of integers k from 1 to n such that the greatest divisor of k that is a unitary divisor of n is a prime number.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	3
7	1
8	0
9	0
10	5
11	1
12	3
13	1
14	7
15	6
16	0
17	1
18	8
19	1
20	3
21	8
22	11
23	1
24	7
25	0
26	13
27	0
28	3
29	1
30	14
31	1
32	0
33	12
34	17
35	10
36	0
37	1
38	19
39	14
40	7
41	1
42	20
43	1
44	3
45	8
46	23
47	1
48	15
49	0
50	24
51	18
52	3
53	1
54	26
55	14
56	7
57	20
58	29
59	1
60	18
61	1
62	31
63	8
64	0
65	16
66	32
67	1
68	3
69	24
70	34
71	1
72	0
73	1
74	37
75	24
76	3
77	16
78	38

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	3
7	1
8	0
9	0
10	5
11	1
12	3
13	1
14	7
15	6
16	0
17	1
18	8
19	1
20	3
21	8
22	11
23	1
24	7
25	0
26	13
27	0
28	3
29	1
30	14
31	1
32	0
33	12
34	17
35	10
36	0
37	1
38	19
39	14
40	7
41	1
42	20
43	1
44	3
45	8
46	23
47	1
48	15
49	0
50	24
51	18
52	3
53	1
54	26
55	14
56	7
57	20
58	29
59	1
60	18
61	1
62	31
63	8
64	0
65	16
66	32
67	1
68	3
69	24
70	34
71	1
72	0
73	1
74	37
75	24
76	3
77	16
78	38

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	3
7	1
8	0
9	0
10	5
11	1
12	3
13	1
14	7
15	6
16	0
17	1
18	8
19	1
20	3
21	8
22	11
23	1
24	7
25	0
26	13
27	0
28	3
29	1
30	14
31	1
32	0
33	12
34	17
35	10
36	0
37	1
38	19
39	14
40	7
41	1
42	20
43	1
44	3
45	8
46	23
47	1
48	15
49	0
50	24
51	18
52	3
53	1
54	26
55	14
56	7
57	20
58	29
59	1
60	18
61	1
62	31
63	8
64	0
65	16
66	32
67	1
68	3
69	24
70	34
71	1
72	0
73	1
74	37
75	24
76	3
77	16
78	38