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 A178897 #5 Jul 30 2015 23:20:54 %S A178897 0,11,22,31,44,55,62,71,88,91,110,111,124,143,142,159,176,187,182,191, %T A178897 220,215,222,247,248,251,286,287,284,319,318,319,352,363,374,383,364, %U A178897 375,382,423,440,443,430,431,444,495,494,511,496,507,502,511,572,567 %N A178897 a(n) = n OR 10n, where OR is bitwise OR. %t A178897 f[n_] := BitOr[n, 10n]; Array[f, 54, 0] (* _Robert G. Wilson v_, Jun 28 2010 *) %Y A178897 Cf. A163617, A178890, A178891, A178892, A178893, A178894, A178895, A178896. %K A178897 nonn %O A178897 0,2 %A A178897 _Dmitry Kamenetsky_, Jun 21 2010 %E A178897 More terms from _Robert G. Wilson v_, Jun 28 2010