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 A055478 #9 Jul 02 2025 16:01:59 %S A055478 1,13,202,2626,41104,564355,11333311,150666343,2322662122,33531600616, %T A055478 502544411644,10140043655335,132150634516021,2051322215344303, %U A055478 30030522136142242,420430421136212506,6066226105140066214 %N A055478 Powers of ten written in base 7. %H A055478 Harvey P. Dale, <a href="/A055478/b055478.txt">Table of n, a(n) for n = 0..800</a> %t A055478 FromDigits[IntegerDigits[#,7]]&/@(10^Range[0,20]) (* _Harvey P. Dale_, May 24 2012 *) %Y A055478 Cf. A000468, A011557. %K A055478 base,easy,nonn %O A055478 0,2 %A A055478 _Henry Bottomley_, Jun 27 2000 %E A055478 More terms from _James Sellers_, Jul 04 2000