A224714 - cp's OEIS frontend

A224714 The number of unordered partitions {a,b} of the odd numbers 2n-1 such that one of a and b is composite and the other is prime.

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

[0, 0, 0, 1, 2, 4, 3, 4, 6, 5, 6, 8, 7, 9, 9, 8, 9, 11, 11, 10, 12, 11, 12, 14, 13, 15, 15, 14, 16, 16, 15, 16, 18, 18, 17, 19, 18, 19, 21, 21, 20, 22, 21, 23, 23, 22, 24, 24, 24, 23, 25, 24, 25, 27, 26, 27, 29, 28, 30, 30, 30, 30, 30, 30, 29, 31, 30, 32, 32]

cp's OEIS Frontend

A224714 The number of unordered partitions {a,b} of the odd numbers 2n-1 such that one of a and b is composite and the other is prime.

Table of values

List of values

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

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

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