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 A257779 #4 May 08 2015 16:57:22 %S A257779 0,1,2,3,4,5,6,7,8,9,9,9,9,9,9,9,9,9,9,9,8,9,8,8,6,9,8,9,8,7,9,8,9,9, %T A257779 6,8,9,7,5,3,8,7,8,8,8,9,6,3,8,6,5,9,5,8,9,5,7,9,6,3,6,6,8,9,8,4,6,9, %U A257779 6,9,7,8,9,6,8,8,4,7,3,8,8,9,4,9,4,7 %N A257779 Largest k, such that n is a Belgian-k number. %C A257779 See A106039 for definition of Belgian-k numbers; %C A257779 a(n) = A257770(n,A257773(n)); %C A257779 a(n) >= A257778(n); a(A257785(n)) = A257778(A257785(n)). %H A257779 Reinhard Zumkeller, <a href="/A257779/b257779.txt">Table of n, a(n) for n = 0..10000</a> %o A257779 (Haskell) %o A257779 a257779 = last . a257770_row %Y A257779 Cf. A106039, A257770, A257773, A257778. %K A257779 nonn %O A257779 0,3 %A A257779 _Reinhard Zumkeller_, May 08 2015