A262700 - cp's OEIS frontend

A262700 Primes p such that pi(p^2)*pi(q^2) is a square for some prime q < p, where pi(x) denotes the number of primes not exceeding x.

n	a(n)
1	5
2	19
3	31
4	151
5	691
6	1181
7	1489
8	1511
9	1601
10	2579
11	3037
12	7297
13	9661
14	10993
15	11699
16	20407
17	25657
18	33937
19	65099
20	96419
21	102911
22	133157
23	251789
24	411841
25	417271
26	670729
27	808211
28	1179907
29	1671277

[5, 19, 31, 151, 691, 1181, 1489, 1511, 1601, 2579, 3037, 7297, 9661, 10993, 11699, 20407, 25657, 33937, 65099, 96419, 102911, 133157, 251789, 411841, 417271, 670729, 808211, 1179907, 1671277]

cp's OEIS Frontend

A262700 Primes p such that pi(p^2)*pi(q^2) is a square for some prime q < p, where pi(x) denotes the number of primes not exceeding x.

Table of values

List of values