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 A180731 #11 Oct 05 2019 04:46:08 %S A180731 1,23,3404825447,41426511213649,529,6436343,78310985281, %T A180731 865004941741938633917747707002884268046728983,952809757913927, %U A180731 10524515126174167358877236351104092889324551536161 %N A180731 Smallest power of 23 that begins with n. %Y A180731 Cf. A009967, A180729, A180732. %K A180731 nonn,base %O A180731 1,2 %A A180731 _Daniel Mondot_, Sep 18 2010