A227908 - cp's OEIS frontend

A227908 Number of ways to write 2*n = p + q with p, q and (p-1)^2 + q^2 all prime.

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

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

cp's OEIS Frontend

A227908 Number of ways to write 2*n = p + q with p, q and (p-1)^2 + q^2 all prime.

Table of values

List of values

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

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

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