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 A167878 #5 Mar 15 2014 10:40:00 %S A167878 0,2,2,6,8,8,8,8,8,18,20,20,24,26,26,26,26,26,26,26,26,26,26,26,26,26, %T A167878 26,54,56,56,60,62,62,62,62,62,72,74,74,78,80,80,80,80,80,80,80,80,80, %U A167878 80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80,80 %N A167878 A167877(n) + n. %C A167878 No carry occurs when calculating a(n) by adding A167877(n) to n in ternary arithmetic. %H A167878 R. Zumkeller, <a href="/A167878/b167878.txt">Table of n, a(n) for n = 0..10000</a> %o A167878 (Haskell) %o A167878 a167878 n = a167877 n + n -- _Reinhard Zumkeller_, Mar 15 2014 %Y A167878 Cf. A007089, see A167832, A003817 for the decimal and binary cases. %K A167878 base,nonn %O A167878 0,2 %A A167878 _Reinhard Zumkeller_, Nov 14 2009