A369747 - cp's OEIS frontend

A369747 a(n) = Sum_{p|n, p prime} pi(n/p).

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	3
7	0
8	2
9	2
10	4
11	0
12	5
13	0
14	5
15	5
16	4
17	0
18	7
19	0
20	6
21	6
22	6
23	0
24	9
25	3
26	7
27	4
28	8
29	0
30	13
31	0
32	6
33	7
34	8
35	7
36	12
37	0
38	9
39	8
40	12
41	0
42	17
43	0
44	10
45	10
46	10
47	0
48	15
49	4
50	13
51	9
52	11
53	0
54	16
55	8
56	13
57	10
58	11
59	0
60	23
61	0
62	12
63	12
64	11
65	9
66	22
67	0
68	13
69	11
70	21
71	0
72	20
73	0
74	13
75	15
76	14
77	9
78	24
79	0
80	18
81	9

[0, 0, 0, 1, 0, 3, 0, 2, 2, 4, 0, 5, 0, 5, 5, 4, 0, 7, 0, 6, 6, 6, 0, 9, 3, 7, 4, 8, 0, 13, 0, 6, 7, 8, 7, 12, 0, 9, 8, 12, 0, 17, 0, 10, 10, 10, 0, 15, 4, 13, 9, 11, 0, 16, 8, 13, 10, 11, 0, 23, 0, 12, 12, 11, 9, 22, 0, 13, 11, 21, 0, 20, 0, 13, 15, 14, 9, 24, 0, 18, 9]

cp's OEIS Frontend

A369747 a(n) = Sum_{p|n, p prime} pi(n/p).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	3
7	0
8	2
9	2
10	4
11	0
12	5
13	0
14	5
15	5
16	4
17	0
18	7
19	0
20	6
21	6
22	6
23	0
24	9
25	3
26	7
27	4
28	8
29	0
30	13
31	0
32	6
33	7
34	8
35	7
36	12
37	0
38	9
39	8
40	12
41	0
42	17
43	0
44	10
45	10
46	10
47	0
48	15
49	4
50	13
51	9
52	11
53	0
54	16
55	8
56	13
57	10
58	11
59	0
60	23
61	0
62	12
63	12
64	11
65	9
66	22
67	0
68	13
69	11
70	21
71	0
72	20
73	0
74	13
75	15
76	14
77	9
78	24
79	0
80	18
81	9

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	3
7	0
8	2
9	2
10	4
11	0
12	5
13	0
14	5
15	5
16	4
17	0
18	7
19	0
20	6
21	6
22	6
23	0
24	9
25	3
26	7
27	4
28	8
29	0
30	13
31	0
32	6
33	7
34	8
35	7
36	12
37	0
38	9
39	8
40	12
41	0
42	17
43	0
44	10
45	10
46	10
47	0
48	15
49	4
50	13
51	9
52	11
53	0
54	16
55	8
56	13
57	10
58	11
59	0
60	23
61	0
62	12
63	12
64	11
65	9
66	22
67	0
68	13
69	11
70	21
71	0
72	20
73	0
74	13
75	15
76	14
77	9
78	24
79	0
80	18
81	9

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	3
7	0
8	2
9	2
10	4
11	0
12	5
13	0
14	5
15	5
16	4
17	0
18	7
19	0
20	6
21	6
22	6
23	0
24	9
25	3
26	7
27	4
28	8
29	0
30	13
31	0
32	6
33	7
34	8
35	7
36	12
37	0
38	9
39	8
40	12
41	0
42	17
43	0
44	10
45	10
46	10
47	0
48	15
49	4
50	13
51	9
52	11
53	0
54	16
55	8
56	13
57	10
58	11
59	0
60	23
61	0
62	12
63	12
64	11
65	9
66	22
67	0
68	13
69	11
70	21
71	0
72	20
73	0
74	13
75	15
76	14
77	9
78	24
79	0
80	18
81	9