A156878 - cp's OEIS frontend

A156878 Number of primes <= n that are neither safe primes and nor Sophie Germain primes.

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

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

cp's OEIS Frontend

A156878 Number of primes <= n that are neither safe primes and nor Sophie Germain primes.

Table of values

List of values

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

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

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