A325142 - cp's OEIS frontend

A325142 a(n) = k if (n - k, n + k) is the centered Goldbach partition of 2n if it exists and -1 otherwise.

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

[-1, -1, 0, 0, 1, 0, 1, 0, 3, 2, 3, 0, 1, 0, 3, 2, 3, 0, 1, 0, 3, 2, 9, 0, 5, 6, 3, 4, 9, 0, 1, 0, 9, 4, 3, 6, 5, 0, 9, 2, 3, 0, 1, 0, 3, 2, 15, 0, 5, 12, 3, 8, 9, 0, 7, 12, 3, 4, 15, 0, 1, 0, 9, 4, 3, 6, 5, 0, 15, 2, 3, 0, 1, 0, 15, 4, 3, 6, 5, 0, 9, 2, 15, 0]

cp's OEIS Frontend

A325142 a(n) = k if (n - k, n + k) is the centered Goldbach partition of 2n if it exists and -1 otherwise.

Table of values

List of values

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

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

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