A227909 - cp's OEIS frontend

A227909 Number of ways to write 2n = p + q with p, q and (p-1)(q+1) - 1 all prime.

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

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

cp's OEIS Frontend

A227909 Number of ways to write 2n = p + q with p, q and (p-1)(q+1) - 1 all prime.

Table of values

List of values

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

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

cp's OEIS Frontend

A227909 Number of ways to write 2*n = p + q with p, q and (p-1)*(q+1) - 1 all prime.

Table of values

List of values

A227909 Number of ways to write 2n = p + q with p, q and (p-1)(q+1) - 1 all prime.

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