A283235 - cp's OEIS frontend

A283235 Triangle read by rows: n-th row gives the numbers of primes p such that p*prime(k) <= prime(n)^2, k=1..n.

n	a(n)
1	1
2	2
3	2
4	5
5	4
6	3
7	9
8	6
9	4
10	4
11	17
12	12
13	9
14	7
15	5
16	23
17	16
18	11
19	9
20	6
21	6
22	34
23	24
24	16
25	13
26	9
27	8
28	7
29	41
30	30
31	20
32	15
33	11
34	9
35	8
36	8
37	56
38	40
39	27
40	21
41	15
42	12
43	11
44	9
45	9
46	81
47	59
48	39
49	30
50	21
51	18
52	15
53	14
54	11
55	10

[1, 2, 2, 5, 4, 3, 9, 6, 4, 4, 17, 12, 9, 7, 5, 23, 16, 11, 9, 6, 6, 34, 24, 16, 13, 9, 8, 7, 41, 30, 20, 15, 11, 9, 8, 8, 56, 40, 27, 21, 15, 12, 11, 9, 9, 81, 59, 39, 30, 21, 18, 15, 14, 11, 10]

cp's OEIS Frontend

A283235 Triangle read by rows: n-th row gives the numbers of primes p such that p*prime(k) <= prime(n)^2, k=1..n.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	5
5	4
6	3
7	9
8	6
9	4
10	4
11	17
12	12
13	9
14	7
15	5
16	23
17	16
18	11
19	9
20	6
21	6
22	34
23	24
24	16
25	13
26	9
27	8
28	7
29	41
30	30
31	20
32	15
33	11
34	9
35	8
36	8
37	56
38	40
39	27
40	21
41	15
42	12
43	11
44	9
45	9
46	81
47	59
48	39
49	30
50	21
51	18
52	15
53	14
54	11
55	10

n	a(n)
1	1
2	2
3	2
4	5
5	4
6	3
7	9
8	6
9	4
10	4
11	17
12	12
13	9
14	7
15	5
16	23
17	16
18	11
19	9
20	6
21	6
22	34
23	24
24	16
25	13
26	9
27	8
28	7
29	41
30	30
31	20
32	15
33	11
34	9
35	8
36	8
37	56
38	40
39	27
40	21
41	15
42	12
43	11
44	9
45	9
46	81
47	59
48	39
49	30
50	21
51	18
52	15
53	14
54	11
55	10

n	a(n)
1	1
2	2
3	2
4	5
5	4
6	3
7	9
8	6
9	4
10	4
11	17
12	12
13	9
14	7
15	5
16	23
17	16
18	11
19	9
20	6
21	6
22	34
23	24
24	16
25	13
26	9
27	8
28	7
29	41
30	30
31	20
32	15
33	11
34	9
35	8
36	8
37	56
38	40
39	27
40	21
41	15
42	12
43	11
44	9
45	9
46	81
47	59
48	39
49	30
50	21
51	18
52	15
53	14
54	11
55	10