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Least k such that k^n divides A000254(k).
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%I #5 Mar 30 2012 18:39:22

%S 6,6,12,20,20,24,36,45,48,48,60,60,72,72,72,72,80,90,90,120,120,120,

%T 120,120,120,120,120,120,144,144,144,144,144,180,180,180,180,180,180,

%U 180,180,240,240,240,240,240,240,240,240,240,240,240,240,240,240,360,360

%N Least k such that k^n divides A000254(k).

%K nonn

%O 1,1

%A _Benoit Cloitre_, Mar 09 2004