A210480 - cp's OEIS frontend

A210480 Number of primes p with p-1 and p+1 both practical, and n-p prime or practical.

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

[0, 0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 3, 3, 4, 4, 4, 5, 4, 4, 3, 3, 2, 2, 4, 4, 4, 5, 5, 7, 6, 6, 3, 4, 3, 3, 5, 5, 4, 5, 5, 7, 7, 6, 4, 3, 3, 4, 4, 3, 2, 4, 4, 7, 6, 6, 3, 3, 4, 4, 4, 4, 2, 4, 4, 6, 5, 5, 3, 2, 4, 4, 6, 3, 3, 4, 4, 7, 5, 6, 4, 4, 4, 4, 7, 6, 5, 4, 3, 8, 5, 7, 3, 3, 5]

cp's OEIS Frontend

A210480 Number of primes p with p-1 and p+1 both practical, and n-p prime or practical.

Table of values

List of values

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

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

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