A259789 - cp's OEIS frontend

A259789 Least integer k > 1 such that pi(k)pi(kn) is a square, where pi(.) is the prime-counting function given by A000720.

n	a(n)
1	2
2	27
3	8
4	2
5	2
6	9
7	3
8	5
9	96
10	10
11	9
12	2
13	2
14	2
15	28
16	4
17	9
18	11
19	8
20	195
21	3
22	3
23	723
24	28
25	573
26	225
27	2
28	2
29	2
30	35
31	46
32	132
33	4
34	4
35	65
36	14
37	58
38	11
39	8
40	967
41	311
42	10
43	98
44	3
45	3
46	21
47	94
48	20
49	2
50	2
51	28
52	23
53	30
54	16
55	29
56	3419
57	134
58	4
59	251
60	7

[2, 27, 8, 2, 2, 9, 3, 5, 96, 10, 9, 2, 2, 2, 28, 4, 9, 11, 8, 195, 3, 3, 723, 28, 573, 225, 2, 2, 2, 35, 46, 132, 4, 4, 65, 14, 58, 11, 8, 967, 311, 10, 98, 3, 3, 21, 94, 20, 2, 2, 28, 23, 30, 16, 29, 3419, 134, 4, 251, 7]

cp's OEIS Frontend

A259789 Least integer k > 1 such that pi(k)pi(kn) is a square, where pi(.) is the prime-counting function given by A000720.

Table of values

List of values

cp's OEIS Frontend

A259789 Least integer k > 1 such that pi(k)*pi(k*n) is a square, where pi(.) is the prime-counting function given by A000720.

Table of values

List of values

A259789 Least integer k > 1 such that pi(k)pi(kn) is a square, where pi(.) is the prime-counting function given by A000720.