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 A357752 #6 Oct 12 2022 08:59:53 %S A357752 4,9,27,49,125,243,484,1000,2025,3969,8100,16129,32761,65025,131044, %T A357752 261121,524176,1046529,2096704,4190209,8386816,16769025,33547264, %U A357752 67092481,134212225,268402689,536848900,1073676289,2147395600,4294836225,8589767761,17179607041,34359441769 %N A357752 a(n) is the largest perfect power < 2^n. %C A357752 Are all terms > 1000 identical to A357754? %o A357752 (PARI) for (n=3, 35, forstep (k=2^n-1, 0, -1, if(ispower(k), print1(k,", "); break))) %Y A357752 Cf. A000079, A001597, A357751, A357754. %K A357752 nonn %O A357752 3,1 %A A357752 _Hugo Pfoertner_, Oct 12 2022