A143537 - cp's OEIS frontend

A143537 Triangle read by rows: T(n,k) = number of primes in the interval [k..n], n >= 1, 1 <= k <= n.

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

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

cp's OEIS Frontend

A143537 Triangle read by rows: T(n,k) = number of primes in the interval [k..n], n >= 1, 1 <= k <= n.

Table of values

List of values

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

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

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