A202472 - cp's OEIS frontend

A202472 Goldbach's Problem extended to subtraction: number of decompositions of 2n into unordered differences of two primes, p, q, where p < 2n < q.

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

[0, 1, 1, 2, 2, 3, 2, 3, 3, 3, 2, 6, 4, 3, 6, 3, 4, 6, 4, 5, 8, 4, 4, 7, 6, 4, 9, 8, 4, 11, 5, 5, 11, 6, 8, 9, 4, 7, 11, 7, 4, 13, 7, 5, 15, 7, 8, 13, 8, 9, 11, 7, 7, 13, 10, 5, 13, 7, 7, 19, 9, 8, 17, 9, 10, 16, 9, 9, 15, 12, 7, 19, 9, 7, 19, 9, 12, 17, 8, 14]

cp's OEIS Frontend

A202472 Goldbach's Problem extended to subtraction: number of decompositions of 2n into unordered differences of two primes, p, q, where p < 2n < q.

Table of values

List of values

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

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

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