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 A067506 #9 Aug 14 2017 23:27:50 %S A067506 1,9,81,150094635296999121 %N A067506 Powers of 9 with digit sum also a power of 9. %C A067506 The next term is too large to include. - _Sascha Kurz_, Mar 18 2002 %Y A067506 Cf. A067499, A067500, A067501, A067502, A067503, A067504, A067505. %K A067506 base,easy,nonn %O A067506 1,2 %A A067506 _Amarnath Murthy_, Feb 11 2002