A238281 - cp's OEIS frontend

A238281 a(n) = |{0 < k < n: the two intervals (kn, (k+1)n) and ((k+1)n, (k+2)n) contain the same number of primes}|.

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

[0, 1, 2, 1, 2, 3, 3, 1, 5, 2, 4, 4, 8, 3, 7, 4, 4, 4, 2, 3, 7, 3, 10, 4, 12, 7, 7, 15, 7, 9, 8, 5, 8, 9, 11, 8, 8, 10, 8, 4, 10, 10, 10, 11, 7, 10, 8, 11, 8, 8, 9, 9, 8, 11, 7, 8, 13, 10, 8, 14, 13, 4, 14, 8, 11, 12, 14, 12, 8, 10, 16, 12, 16, 12, 14, 19, 11, 14, 8, 9]

cp's OEIS Frontend

A238281 a(n) = |{0 < k < n: the two intervals (kn, (k+1)n) and ((k+1)n, (k+2)n) contain the same number of primes}|.

Table of values

List of values

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

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

cp's OEIS Frontend

A238281 a(n) = |{0 < k < n: the two intervals (k*n, (k+1)*n) and ((k+1)*n, (k+2)*n) contain the same number of primes}|.

Table of values

List of values

A238281 a(n) = |{0 < k < n: the two intervals (kn, (k+1)n) and ((k+1)n, (k+2)n) contain the same number of primes}|.

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