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 A067503 #13 Dec 24 2022 04:52:44 %S A067503 1,6,279936,1679616,10077696,60466176,13060694016, %T A067503 4849687664788584363858837602739217760256, %U A067503 174588755932389037098918153698611839369216 %N A067503 Powers of 6 with digit sum also a power of 6. %t A067503 Select[6^(Range[54]-1),IntegerQ[Log[6,Total[IntegerDigits[#]]]]&] (* _Stefano Spezia_, Dec 23 2022 *) %Y A067503 Cf. A066002, A067499, A067500, A067501, A067502. %K A067503 base,easy,nonn %O A067503 1,2 %A A067503 _Amarnath Murthy_, Feb 11 2002 %E A067503 More terms from _Sascha Kurz_, Mar 18 2002