A219791 - cp's OEIS frontend

A219791 Number of ways to write n=x+y (0 with (xy)^2+1 prime.

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	0
7	2
8	1
9	2
10	2
11	2
12	2
13	2
14	2
15	5
16	0
17	2
18	1
19	2
20	2
21	4
22	2
23	4
24	0
25	6
26	2
27	6
28	2
29	5
30	3
31	6
32	3
33	5
34	4
35	7
36	3
37	6
38	2
39	5
40	6
41	6
42	1
43	6
44	5
45	4
46	1
47	6
48	2
49	7
50	5
51	5
52	2
53	9
54	3
55	8
56	4
57	8
58	3
59	6
60	6
61	4
62	3
63	9
64	4
65	13
66	4
67	9
68	4
69	5
70	9
71	2
72	1
73	11
74	4
75	14
76	4
77	10
78	3
79	9
80	8
81	4
82	3
83	6
84	5
85	10
86	3

[0, 1, 1, 1, 2, 0, 2, 1, 2, 2, 2, 2, 2, 2, 5, 0, 2, 1, 2, 2, 4, 2, 4, 0, 6, 2, 6, 2, 5, 3, 6, 3, 5, 4, 7, 3, 6, 2, 5, 6, 6, 1, 6, 5, 4, 1, 6, 2, 7, 5, 5, 2, 9, 3, 8, 4, 8, 3, 6, 6, 4, 3, 9, 4, 13, 4, 9, 4, 5, 9, 2, 1, 11, 4, 14, 4, 10, 3, 9, 8, 4, 3, 6, 5, 10, 3]

cp's OEIS Frontend

A219791 Number of ways to write n=x+y (0 with (xy)^2+1 prime.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	0
7	2
8	1
9	2
10	2
11	2
12	2
13	2
14	2
15	5
16	0
17	2
18	1
19	2
20	2
21	4
22	2
23	4
24	0
25	6
26	2
27	6
28	2
29	5
30	3
31	6
32	3
33	5
34	4
35	7
36	3
37	6
38	2
39	5
40	6
41	6
42	1
43	6
44	5
45	4
46	1
47	6
48	2
49	7
50	5
51	5
52	2
53	9
54	3
55	8
56	4
57	8
58	3
59	6
60	6
61	4
62	3
63	9
64	4
65	13
66	4
67	9
68	4
69	5
70	9
71	2
72	1
73	11
74	4
75	14
76	4
77	10
78	3
79	9
80	8
81	4
82	3
83	6
84	5
85	10
86	3

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	0
7	2
8	1
9	2
10	2
11	2
12	2
13	2
14	2
15	5
16	0
17	2
18	1
19	2
20	2
21	4
22	2
23	4
24	0
25	6
26	2
27	6
28	2
29	5
30	3
31	6
32	3
33	5
34	4
35	7
36	3
37	6
38	2
39	5
40	6
41	6
42	1
43	6
44	5
45	4
46	1
47	6
48	2
49	7
50	5
51	5
52	2
53	9
54	3
55	8
56	4
57	8
58	3
59	6
60	6
61	4
62	3
63	9
64	4
65	13
66	4
67	9
68	4
69	5
70	9
71	2
72	1
73	11
74	4
75	14
76	4
77	10
78	3
79	9
80	8
81	4
82	3
83	6
84	5
85	10
86	3

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	0
7	2
8	1
9	2
10	2
11	2
12	2
13	2
14	2
15	5
16	0
17	2
18	1
19	2
20	2
21	4
22	2
23	4
24	0
25	6
26	2
27	6
28	2
29	5
30	3
31	6
32	3
33	5
34	4
35	7
36	3
37	6
38	2
39	5
40	6
41	6
42	1
43	6
44	5
45	4
46	1
47	6
48	2
49	7
50	5
51	5
52	2
53	9
54	3
55	8
56	4
57	8
58	3
59	6
60	6
61	4
62	3
63	9
64	4
65	13
66	4
67	9
68	4
69	5
70	9
71	2
72	1
73	11
74	4
75	14
76	4
77	10
78	3
79	9
80	8
81	4
82	3
83	6
84	5
85	10
86	3