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%I #4 Jan 17 2019 17:17:50
%S 1,2,3,5,7,11,13,16,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,
%T 81,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,
%U 173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263
%N Numbers of the form p^(k^2) where p is prime and k >= 0.
%t Select[Range[100],#==1||PrimePowerQ[#]&&IntegerQ[Sqrt[FactorInteger[#][[1,2]]]]&]
%Y Cf. A000290, A000961, A001248, A001597, A026478, A050376, A277562, A323519, A323526, A323528.
%K nonn
%O 1,2
%A _Gus Wiseman_, Jan 17 2019
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