A219842 - cp's OEIS frontend

A219842 Number of ways to write n as x+y (0 with 2x*y+1 prime.

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

[0, 1, 1, 1, 1, 3, 1, 1, 4, 2, 2, 4, 2, 2, 7, 4, 1, 3, 4, 5, 5, 4, 2, 8, 2, 7, 4, 2, 8, 11, 5, 3, 8, 7, 5, 14, 7, 5, 10, 8, 7, 8, 4, 8, 9, 5, 4, 11, 6, 11, 14, 5, 3, 19, 12, 7, 11, 6, 9, 12, 13, 8, 9, 10, 12, 16, 5, 6, 22, 8, 11, 11, 5, 10, 26, 15, 5, 11, 15, 10]

cp's OEIS Frontend

A219842 Number of ways to write n as x+y (0 with 2x*y+1 prime.

Table of values

List of values

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

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

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