A108309 - cp's OEIS frontend

A108309 Consider the triangle of odd numbers where the n-th row has the next n odd numbers. The sequence is the number of primes in the n-th row.

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

[0, 2, 2, 3, 2, 3, 3, 4, 4, 5, 3, 4, 6, 4, 6, 6, 4, 6, 7, 6, 8, 7, 5, 8, 9, 8, 7, 8, 9, 8, 9, 10, 10, 8, 10, 12, 5, 12, 12, 13, 9, 11, 11, 9, 13, 14, 9, 14, 14, 10, 10, 19, 14, 12, 12, 12, 12, 16, 15, 16, 15, 13, 18, 16, 16, 12, 16, 17, 15, 16, 18, 14, 15, 20, 18, 19, 14, 19, 20, 18, 16]

cp's OEIS Frontend

A108309 Consider the triangle of odd numbers where the n-th row has the next n odd numbers. The sequence is the number of primes in the n-th row.

Table of values

List of values

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

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

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