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Divisors of 60^2 that are not divisors of 60.
3

%I #6 Jun 21 2017 22:29:33

%S 8,9,16,18,24,25,36,40,45,48,50,72,75,80,90,100,120,144,150,180,200,

%T 225,240,300,360,400,450,600,720,900,1200,1800,3600

%N Divisors of 60^2 that are not divisors of 60.

%C Set difference A035303 minus A018266;

%C sequence is finite with last term a(33)=3600=60^2; A055205(60)=33.

%o (PARI) setminus(divisors(3600),divisors(60)) \\ _Charles R Greathouse IV_, Jun 21 2017

%K fini,full,nonn,easy

%O 1,1

%A _Reinhard Zumkeller_, Dec 08 2009