A321858 - cp's OEIS frontend

A321858 a(n) = Pi(12,5)(n) + Pi(12,7)(n) - Pi(12,1)(n) - Pi(12,11)(n) where Pi(a,b)(x) denotes the number of primes in the arithmetic progression a*k + b less than or equal to x.

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

[0, 0, 0, 0, 1, 1, 2, 2, 2, 2, 1, 1, 0, 0, 0, 0, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1]

cp's OEIS Frontend

A321858 a(n) = Pi(12,5)(n) + Pi(12,7)(n) - Pi(12,1)(n) - Pi(12,11)(n) where Pi(a,b)(x) denotes the number of primes in the arithmetic progression a*k + b less than or equal to x.

Table of values

List of values

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

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

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