A007457 - cp's OEIS frontend

A007457 Number of (j,k): j+k=n, (j,n)=(k,n)=1, j,k squarefree.

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

[0, 1, 2, 2, 2, 2, 4, 4, 2, 2, 4, 4, 6, 4, 4, 6, 8, 6, 6, 6, 4, 8, 8, 8, 8, 8, 8, 6, 10, 8, 10, 10, 8, 12, 8, 10, 14, 12, 10, 12, 16, 10, 18, 14, 12, 14, 16, 14, 16, 14, 10, 16, 20, 14, 12, 16, 14, 20, 18, 14, 22, 20, 16, 20]

cp's OEIS Frontend

A007457 Number of (j,k): j+k=n, (j,n)=(k,n)=1, j,k squarefree.

Table of values

List of values

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

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

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