A220554 - cp's OEIS frontend

A220554 Number of ways to write 2n = p+q (q>0) with p, 2p+1 and (p-1)^2+q^2 all prime.

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

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

cp's OEIS Frontend

A220554 Number of ways to write 2n = p+q (q>0) with p, 2p+1 and (p-1)^2+q^2 all prime.

Table of values

List of values

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

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

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