A238165 - cp's OEIS frontend

A238165 Number of pairs {j, k} with 0 < j < k <= n such that pi(jn) divides pi(kn), where pi(.) is given by A000720.

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

[0, 1, 1, 2, 3, 2, 1, 5, 5, 5, 3, 5, 12, 5, 5, 7, 3, 2, 12, 7, 8, 9, 9, 6, 6, 11, 9, 12, 9, 15, 12, 12, 13, 7, 16, 12, 18, 15, 16, 11, 8, 8, 13, 15, 20, 13, 7, 15, 13, 7, 18, 7, 18, 15, 11, 15, 15, 12, 15, 17, 6, 18, 17, 16, 11, 15, 9, 18, 15, 13]

cp's OEIS Frontend

A238165 Number of pairs {j, k} with 0 < j < k <= n such that pi(jn) divides pi(kn), where pi(.) is given by A000720.

Table of values

List of values

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

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

cp's OEIS Frontend

A238165 Number of pairs {j, k} with 0 < j < k <= n such that pi(j*n) divides pi(k*n), where pi(.) is given by A000720.

Table of values

List of values

A238165 Number of pairs {j, k} with 0 < j < k <= n such that pi(jn) divides pi(kn), where pi(.) is given by A000720.

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