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 A339596 #4 Jan 02 2021 11:54:58 %S A339596 0,16,81,80,625,81,2401,176,405,625,14641,113,28561 %N A339596 Four-dimensional Kempner (or Kempner-Smarandache) numbers. %H A339596 Norbert Hungerbühler, Ernst Specker, <a href="http://www.emis.de/journals/INTEGERS/papers/g23/g23.Abstract.html">A generalization of the Smarandache Function to several variables</a>, INTEGERS 6 (2006) #A23 %Y A339596 Cf. A002034, A339594, A339595. %K A339596 nonn,more %O A339596 1,2 %A A339596 _N. J. A. Sloane_, Jan 02 2021