A103273 - cp's OEIS frontend

A103273 Number of ways of writing prime(n)-1 in the form prime(i)+prime(j).

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

[0, 0, 1, 1, 2, 1, 2, 2, 3, 2, 3, 4, 3, 4, 4, 3, 4, 6, 6, 5, 6, 7, 5, 4, 7, 6, 8, 6, 8, 7, 10, 7, 5, 8, 5, 12, 11, 10, 6, 6, 7, 14, 8, 11, 9, 13, 19, 11, 7, 12, 7, 9, 18, 9, 8, 9, 9, 19, 16, 14, 16, 8, 15, 12, 17, 10, 24, 19, 9, 16, 10, 10, 18, 18, 22, 10, 9, 21, 14, 20, 11, 30, 14, 19, 21, 13, 13]

cp's OEIS Frontend

A103273 Number of ways of writing prime(n)-1 in the form prime(i)+prime(j).

Table of values

List of values

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

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

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