This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A323520 #4 Jan 17 2019 17:17:50 %S A323520 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 A323520 81,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167, %U A323520 173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263 %N A323520 Numbers of the form p^(k^2) where p is prime and k >= 0. %t A323520 Select[Range[100],#==1||PrimePowerQ[#]&&IntegerQ[Sqrt[FactorInteger[#][[1,2]]]]&] %Y A323520 Cf. A000290, A000961, A001248, A001597, A026478, A050376, A277562, A323519, A323526, A323528. %K A323520 nonn %O A323520 1,2 %A A323520 _Gus Wiseman_, Jan 17 2019