A275768 - cp's OEIS frontend

A275768 a(n) is the number of ways to express n = (prime(i) + prime(j))/2 when (prime(i) - prime(j))/2 also is prime.

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

[0, 0, 0, 0, 0, 1, 0, 0, 2, 1, 2, 0, 2, 0, 1, 1, 2, 0, 3, 0, 2, 1, 1, 0, 5, 0, 1, 0, 0, 0, 5, 0, 1, 0, 1, 0, 5, 0, 0, 1, 1, 0, 6, 0, 1, 1, 1, 0, 5, 0, 2, 0, 0, 0, 5, 0, 2, 0, 0, 0, 10, 0, 0, 0, 1, 0, 8, 0, 0, 1, 2, 0, 6, 0, 0, 0, 2, 0, 8, 0, 0, 1]

cp's OEIS Frontend

A275768 a(n) is the number of ways to express n = (prime(i) + prime(j))/2 when (prime(i) - prime(j))/2 also is prime.

Table of values

List of values

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

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

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