A210681 - cp's OEIS frontend

A210681 Number of ways to write 2n = p+q+r (p<=q) with p, q, r-1, r+1 all prime and p-1, p+1, q-1, q+1, r all practical.

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	5
14	6
15	4
16	3
17	2
18	4
19	7
20	10
21	8
22	5
23	3
24	5
25	8
26	12
27	10
28	6
29	2
30	3
31	6
32	11
33	12
34	6
35	4
36	3
37	5
38	9
39	10
40	6
41	5
42	4
43	5
44	8
45	8
46	5
47	7
48	7
49	6
50	8
51	7
52	6
53	6
54	8
55	6
56	7
57	8
58	5
59	7
60	8
61	6
62	7
63	7
64	4
65	6
66	7
67	5
68	6
69	8
70	4
71	8
72	6
73	4
74	5
75	7
76	5
77	5
78	8
79	5
80	6
81	8
82	6
83	4
84	7
85	6
86	6
87	7
88	5
89	3
90	7
91	3
92	4
93	8
94	6
95	8
96	5
97	4
98	3
99	7
100	6

[0, 0, 0, 0, 1, 2, 3, 3, 3, 2, 2, 3, 5, 6, 4, 3, 2, 4, 7, 10, 8, 5, 3, 5, 8, 12, 10, 6, 2, 3, 6, 11, 12, 6, 4, 3, 5, 9, 10, 6, 5, 4, 5, 8, 8, 5, 7, 7, 6, 8, 7, 6, 6, 8, 6, 7, 8, 5, 7, 8, 6, 7, 7, 4, 6, 7, 5, 6, 8, 4, 8, 6, 4, 5, 7, 5, 5, 8, 5, 6, 8, 6, 4, 7, 6, 6, 7, 5, 3, 7, 3, 4, 8, 6, 8, 5, 4, 3, 7, 6]

cp's OEIS Frontend

A210681 Number of ways to write 2n = p+q+r (p<=q) with p, q, r-1, r+1 all prime and p-1, p+1, q-1, q+1, r all practical.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	5
14	6
15	4
16	3
17	2
18	4
19	7
20	10
21	8
22	5
23	3
24	5
25	8
26	12
27	10
28	6
29	2
30	3
31	6
32	11
33	12
34	6
35	4
36	3
37	5
38	9
39	10
40	6
41	5
42	4
43	5
44	8
45	8
46	5
47	7
48	7
49	6
50	8
51	7
52	6
53	6
54	8
55	6
56	7
57	8
58	5
59	7
60	8
61	6
62	7
63	7
64	4
65	6
66	7
67	5
68	6
69	8
70	4
71	8
72	6
73	4
74	5
75	7
76	5
77	5
78	8
79	5
80	6
81	8
82	6
83	4
84	7
85	6
86	6
87	7
88	5
89	3
90	7
91	3
92	4
93	8
94	6
95	8
96	5
97	4
98	3
99	7
100	6

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	5
14	6
15	4
16	3
17	2
18	4
19	7
20	10
21	8
22	5
23	3
24	5
25	8
26	12
27	10
28	6
29	2
30	3
31	6
32	11
33	12
34	6
35	4
36	3
37	5
38	9
39	10
40	6
41	5
42	4
43	5
44	8
45	8
46	5
47	7
48	7
49	6
50	8
51	7
52	6
53	6
54	8
55	6
56	7
57	8
58	5
59	7
60	8
61	6
62	7
63	7
64	4
65	6
66	7
67	5
68	6
69	8
70	4
71	8
72	6
73	4
74	5
75	7
76	5
77	5
78	8
79	5
80	6
81	8
82	6
83	4
84	7
85	6
86	6
87	7
88	5
89	3
90	7
91	3
92	4
93	8
94	6
95	8
96	5
97	4
98	3
99	7
100	6

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	5
14	6
15	4
16	3
17	2
18	4
19	7
20	10
21	8
22	5
23	3
24	5
25	8
26	12
27	10
28	6
29	2
30	3
31	6
32	11
33	12
34	6
35	4
36	3
37	5
38	9
39	10
40	6
41	5
42	4
43	5
44	8
45	8
46	5
47	7
48	7
49	6
50	8
51	7
52	6
53	6
54	8
55	6
56	7
57	8
58	5
59	7
60	8
61	6
62	7
63	7
64	4
65	6
66	7
67	5
68	6
69	8
70	4
71	8
72	6
73	4
74	5
75	7
76	5
77	5
78	8
79	5
80	6
81	8
82	6
83	4
84	7
85	6
86	6
87	7
88	5
89	3
90	7
91	3
92	4
93	8
94	6
95	8
96	5
97	4
98	3
99	7
100	6