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Nonsquarefree numbers that are not divisible by p^p for any prime p.
4

%I #11 Mar 12 2024 19:02:20

%S 9,18,25,45,49,50,63,75,90,98,99,117,121,125,126,147,150,153,169,171,

%T 175,198,207,225,234,242,245,250,261,275,279,289,294,306,315,325,333,

%U 338,342,343,350,361,363,369,375,387,414,423,425,441,450,475,477,490,495,507,522,525,529,531,539,549,550,558,575,578

%N Nonsquarefree numbers that are not divisible by p^p for any prime p.

%C The asymptotic density of this sequence is Product_{p prime} (1 - 1/p^p) - 6/Pi^2 = 0.1140631325... . - _Amiram Eldar_, Mar 12 2024

%H Antti Karttunen, <a href="/A371083/b371083.txt">Table of n, a(n) for n = 1..10000</a>

%o (PARI) \\ See A371083.

%Y Intersection of A013929 and A048103.

%Y Cf. A371084 (characteristic function), A371085 (subsequence), A059956.

%K nonn

%O 1,1

%A _Antti Karttunen_, Mar 12 2024