A219923 - cp's OEIS frontend

A219923 Number of ways to write n=x+y (x>0, y>0) with x-1, x+1 and 2xy+1 all prime.

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

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

cp's OEIS Frontend

A219923 Number of ways to write n=x+y (x>0, y>0) with x-1, x+1 and 2xy+1 all prime.

Table of values

List of values

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

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

cp's OEIS Frontend

A219923 Number of ways to write n=x+y (x>0, y>0) with x-1, x+1 and 2*x*y+1 all prime.

Table of values

List of values

A219923 Number of ways to write n=x+y (x>0, y>0) with x-1, x+1 and 2xy+1 all prime.

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