A071681 - cp's OEIS frontend

A071681 Number of ways to represent the n-th prime as arithmetic mean of two other primes.

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	2
7	3
8	1
9	3
10	3
11	2
12	4
13	4
14	4
15	4
16	5
17	5
18	3
19	5
20	7
21	5
22	4
23	5
24	6
25	6
26	8
27	6
28	7
29	6
30	6
31	8
32	8
33	10
34	6
35	10
36	8
37	8
38	6
39	10
40	8
41	9
42	7
43	9
44	11
45	10
46	6
47	10
48	11
49	11
50	8
51	12
52	10
53	10
54	14
55	13
56	14
57	13
58	9
59	10
60	13
61	12
62	12
63	14
64	16
65	11
66	13
67	13
68	14
69	18
70	13
71	18
72	14
73	14
74	17
75	14
76	16
77	14
78	16
79	15
80	16
81	16
82	17
83	16
84	16

[0, 0, 1, 1, 2, 2, 3, 1, 3, 3, 2, 4, 4, 4, 4, 5, 5, 3, 5, 7, 5, 4, 5, 6, 6, 8, 6, 7, 6, 6, 8, 8, 10, 6, 10, 8, 8, 6, 10, 8, 9, 7, 9, 11, 10, 6, 10, 11, 11, 8, 12, 10, 10, 14, 13, 14, 13, 9, 10, 13, 12, 12, 14, 16, 11, 13, 13, 14, 18, 13, 18, 14, 14, 17, 14, 16, 14, 16, 15, 16, 16, 17, 16, 16]

cp's OEIS Frontend

A071681 Number of ways to represent the n-th prime as arithmetic mean of two other primes.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	2
7	3
8	1
9	3
10	3
11	2
12	4
13	4
14	4
15	4
16	5
17	5
18	3
19	5
20	7
21	5
22	4
23	5
24	6
25	6
26	8
27	6
28	7
29	6
30	6
31	8
32	8
33	10
34	6
35	10
36	8
37	8
38	6
39	10
40	8
41	9
42	7
43	9
44	11
45	10
46	6
47	10
48	11
49	11
50	8
51	12
52	10
53	10
54	14
55	13
56	14
57	13
58	9
59	10
60	13
61	12
62	12
63	14
64	16
65	11
66	13
67	13
68	14
69	18
70	13
71	18
72	14
73	14
74	17
75	14
76	16
77	14
78	16
79	15
80	16
81	16
82	17
83	16
84	16

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	2
7	3
8	1
9	3
10	3
11	2
12	4
13	4
14	4
15	4
16	5
17	5
18	3
19	5
20	7
21	5
22	4
23	5
24	6
25	6
26	8
27	6
28	7
29	6
30	6
31	8
32	8
33	10
34	6
35	10
36	8
37	8
38	6
39	10
40	8
41	9
42	7
43	9
44	11
45	10
46	6
47	10
48	11
49	11
50	8
51	12
52	10
53	10
54	14
55	13
56	14
57	13
58	9
59	10
60	13
61	12
62	12
63	14
64	16
65	11
66	13
67	13
68	14
69	18
70	13
71	18
72	14
73	14
74	17
75	14
76	16
77	14
78	16
79	15
80	16
81	16
82	17
83	16
84	16

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	2
7	3
8	1
9	3
10	3
11	2
12	4
13	4
14	4
15	4
16	5
17	5
18	3
19	5
20	7
21	5
22	4
23	5
24	6
25	6
26	8
27	6
28	7
29	6
30	6
31	8
32	8
33	10
34	6
35	10
36	8
37	8
38	6
39	10
40	8
41	9
42	7
43	9
44	11
45	10
46	6
47	10
48	11
49	11
50	8
51	12
52	10
53	10
54	14
55	13
56	14
57	13
58	9
59	10
60	13
61	12
62	12
63	14
64	16
65	11
66	13
67	13
68	14
69	18
70	13
71	18
72	14
73	14
74	17
75	14
76	16
77	14
78	16
79	15
80	16
81	16
82	17
83	16
84	16