A219782 - cp's OEIS frontend

A219782 Number of ways to write n=x+y (0 with n^2-xy and n^2+xy both prime.

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	0
9	2
10	0
11	1
12	1
13	3
14	2
15	3
16	1
17	1
18	0
19	2
20	0
21	2
22	1
23	3
24	1
25	2
26	1
27	3
28	2
29	4
30	2
31	2
32	1
33	1
34	2
35	4
36	2
37	3
38	2
39	4
40	3
41	0
42	1
43	2
44	2
45	1
46	0
47	4
48	1
49	4
50	1
51	6
52	2
53	1
54	2
55	6
56	1
57	3
58	0
59	1
60	3
61	5
62	2
63	7
64	2
65	1
66	2
67	4
68	1
69	3
70	3
71	5
72	2
73	1
74	2
75	2
76	2
77	4
78	0
79	3
80	1
81	5
82	2
83	4
84	3
85	2
86	3
87	2
88	3
89	2
90	1
91	4
92	3
93	3
94	2
95	3
96	2
97	7
98	1
99	5
100	5

[0, 1, 1, 1, 1, 1, 1, 0, 2, 0, 1, 1, 3, 2, 3, 1, 1, 0, 2, 0, 2, 1, 3, 1, 2, 1, 3, 2, 4, 2, 2, 1, 1, 2, 4, 2, 3, 2, 4, 3, 0, 1, 2, 2, 1, 0, 4, 1, 4, 1, 6, 2, 1, 2, 6, 1, 3, 0, 1, 3, 5, 2, 7, 2, 1, 2, 4, 1, 3, 3, 5, 2, 1, 2, 2, 2, 4, 0, 3, 1, 5, 2, 4, 3, 2, 3, 2, 3, 2, 1, 4, 3, 3, 2, 3, 2, 7, 1, 5, 5]

cp's OEIS Frontend

A219782 Number of ways to write n=x+y (0 with n^2-xy and n^2+xy both prime.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	0
9	2
10	0
11	1
12	1
13	3
14	2
15	3
16	1
17	1
18	0
19	2
20	0
21	2
22	1
23	3
24	1
25	2
26	1
27	3
28	2
29	4
30	2
31	2
32	1
33	1
34	2
35	4
36	2
37	3
38	2
39	4
40	3
41	0
42	1
43	2
44	2
45	1
46	0
47	4
48	1
49	4
50	1
51	6
52	2
53	1
54	2
55	6
56	1
57	3
58	0
59	1
60	3
61	5
62	2
63	7
64	2
65	1
66	2
67	4
68	1
69	3
70	3
71	5
72	2
73	1
74	2
75	2
76	2
77	4
78	0
79	3
80	1
81	5
82	2
83	4
84	3
85	2
86	3
87	2
88	3
89	2
90	1
91	4
92	3
93	3
94	2
95	3
96	2
97	7
98	1
99	5
100	5

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	0
9	2
10	0
11	1
12	1
13	3
14	2
15	3
16	1
17	1
18	0
19	2
20	0
21	2
22	1
23	3
24	1
25	2
26	1
27	3
28	2
29	4
30	2
31	2
32	1
33	1
34	2
35	4
36	2
37	3
38	2
39	4
40	3
41	0
42	1
43	2
44	2
45	1
46	0
47	4
48	1
49	4
50	1
51	6
52	2
53	1
54	2
55	6
56	1
57	3
58	0
59	1
60	3
61	5
62	2
63	7
64	2
65	1
66	2
67	4
68	1
69	3
70	3
71	5
72	2
73	1
74	2
75	2
76	2
77	4
78	0
79	3
80	1
81	5
82	2
83	4
84	3
85	2
86	3
87	2
88	3
89	2
90	1
91	4
92	3
93	3
94	2
95	3
96	2
97	7
98	1
99	5
100	5

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	0
9	2
10	0
11	1
12	1
13	3
14	2
15	3
16	1
17	1
18	0
19	2
20	0
21	2
22	1
23	3
24	1
25	2
26	1
27	3
28	2
29	4
30	2
31	2
32	1
33	1
34	2
35	4
36	2
37	3
38	2
39	4
40	3
41	0
42	1
43	2
44	2
45	1
46	0
47	4
48	1
49	4
50	1
51	6
52	2
53	1
54	2
55	6
56	1
57	3
58	0
59	1
60	3
61	5
62	2
63	7
64	2
65	1
66	2
67	4
68	1
69	3
70	3
71	5
72	2
73	1
74	2
75	2
76	2
77	4
78	0
79	3
80	1
81	5
82	2
83	4
84	3
85	2
86	3
87	2
88	3
89	2
90	1
91	4
92	3
93	3
94	2
95	3
96	2
97	7
98	1
99	5
100	5