A237496 - cp's OEIS frontend

A237496 Number of ordered ways to write n = k + m (0 < k <= m) with pi(k) + pi(m) - 2 prime, where pi(.) is given by A000720.

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

[0, 0, 0, 0, 0, 1, 2, 4, 4, 3, 2, 3, 3, 3, 5, 3, 1, 4, 5, 5, 7, 4, 1, 2, 1, 1, 1, 1, 1, 3, 6, 7, 8, 8, 8, 8, 8, 9, 11, 11, 11, 11, 9, 7, 7, 4, 1, 2, 1, 2, 3, 5, 7, 10, 14, 14, 14, 10, 6, 10, 14, 16, 19, 16, 13, 12, 11, 10, 7, 6, 5, 3, 3, 4, 3, 6, 9, 13, 17, 18]

cp's OEIS Frontend

A237496 Number of ordered ways to write n = k + m (0 < k <= m) with pi(k) + pi(m) - 2 prime, where pi(.) is given by A000720.

Table of values

List of values

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

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

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