A168141 - cp's OEIS frontend

A168141 a(n) = pi(n + 1) - pi(n - 2), where pi is the prime counting function.

n	a(n)
1	1
2	2
3	2
4	2
5	1
6	2
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	1
15	0
16	1
17	1
18	2
19	1
20	1
21	0
22	1
23	1
24	1
25	0
26	0
27	0
28	1
29	1
30	2
31	1
32	1
33	0
34	0
35	0
36	1
37	1
38	1
39	0
40	1
41	1
42	2
43	1
44	1
45	0
46	1
47	1
48	1
49	0
50	0
51	0
52	1
53	1
54	1
55	0
56	0
57	0
58	1
59	1
60	2
61	1
62	1
63	0
64	0
65	0
66	1
67	1
68	1
69	0
70	1
71	1
72	2
73	1
74	1
75	0
76	0
77	0
78	1
79	1
80	1
81	0
82	1
83	1
84	1
85	0
86	0
87	0
88	1
89	1
90	1
91	0
92	0
93	0
94	0
95	0
96	1
97	1
98	1
99	0
100	1
101	1
102	2
103	1
104	1
105	0

[1, 2, 2, 2, 1, 2, 1, 1, 0, 1, 1, 2, 1, 1, 0, 1, 1, 2, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 2, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 2, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 2, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 2, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 2, 1, 1, 0]

cp's OEIS Frontend

A168141 a(n) = pi(n + 1) - pi(n - 2), where pi is the prime counting function.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	2
5	1
6	2
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	1
15	0
16	1
17	1
18	2
19	1
20	1
21	0
22	1
23	1
24	1
25	0
26	0
27	0
28	1
29	1
30	2
31	1
32	1
33	0
34	0
35	0
36	1
37	1
38	1
39	0
40	1
41	1
42	2
43	1
44	1
45	0
46	1
47	1
48	1
49	0
50	0
51	0
52	1
53	1
54	1
55	0
56	0
57	0
58	1
59	1
60	2
61	1
62	1
63	0
64	0
65	0
66	1
67	1
68	1
69	0
70	1
71	1
72	2
73	1
74	1
75	0
76	0
77	0
78	1
79	1
80	1
81	0
82	1
83	1
84	1
85	0
86	0
87	0
88	1
89	1
90	1
91	0
92	0
93	0
94	0
95	0
96	1
97	1
98	1
99	0
100	1
101	1
102	2
103	1
104	1
105	0

n	a(n)
1	1
2	2
3	2
4	2
5	1
6	2
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	1
15	0
16	1
17	1
18	2
19	1
20	1
21	0
22	1
23	1
24	1
25	0
26	0
27	0
28	1
29	1
30	2
31	1
32	1
33	0
34	0
35	0
36	1
37	1
38	1
39	0
40	1
41	1
42	2
43	1
44	1
45	0
46	1
47	1
48	1
49	0
50	0
51	0
52	1
53	1
54	1
55	0
56	0
57	0
58	1
59	1
60	2
61	1
62	1
63	0
64	0
65	0
66	1
67	1
68	1
69	0
70	1
71	1
72	2
73	1
74	1
75	0
76	0
77	0
78	1
79	1
80	1
81	0
82	1
83	1
84	1
85	0
86	0
87	0
88	1
89	1
90	1
91	0
92	0
93	0
94	0
95	0
96	1
97	1
98	1
99	0
100	1
101	1
102	2
103	1
104	1
105	0

n	a(n)
1	1
2	2
3	2
4	2
5	1
6	2
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	1
15	0
16	1
17	1
18	2
19	1
20	1
21	0
22	1
23	1
24	1
25	0
26	0
27	0
28	1
29	1
30	2
31	1
32	1
33	0
34	0
35	0
36	1
37	1
38	1
39	0
40	1
41	1
42	2
43	1
44	1
45	0
46	1
47	1
48	1
49	0
50	0
51	0
52	1
53	1
54	1
55	0
56	0
57	0
58	1
59	1
60	2
61	1
62	1
63	0
64	0
65	0
66	1
67	1
68	1
69	0
70	1
71	1
72	2
73	1
74	1
75	0
76	0
77	0
78	1
79	1
80	1
81	0
82	1
83	1
84	1
85	0
86	0
87	0
88	1
89	1
90	1
91	0
92	0
93	0
94	0
95	0
96	1
97	1
98	1
99	0
100	1
101	1
102	2
103	1
104	1
105	0