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 A074221 #8 Mar 28 2023 17:07:07 %S A074221 3,4,5,11,22,26,32,42,44,45,84,95,97,165,183,198,200,201,204,214,235, %T A074221 247,258,260,267,294,310,365,381,387,389,393,442,456,463,507,543,544, %U A074221 551,588,609,628,676,693,718,729,736,755,767,795,810,842,865,877,885 %N A074221 Numbers k such that floor(k^e) is prime. %e A074221 Floor(3^e) = 19. %t A074221 Select[Range[1000],PrimeQ[Floor[#^E]]&] (* _Harvey P. Dale_, Jul 21 2013 *) %Y A074221 Cf. A001113, A050808. %K A074221 nonn %O A074221 0,1 %A A074221 _Jon Perry_, Sep 17 2002