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A257778 Smallest k, such that n is a Belgian-k number.

%I A257778 #7 May 08 2015 16:57:00
%S A257778 0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,2,1,0,0,8,0,0,0,1,0,2,0,0,6,5,0,0,2,0,
%T A257778 3,0,0,4,2,0,0,1,0,1,0,0,2,3,0,6,0,3,3,0,0,0,1,4,1,3,0,5,0,0,4,4,0,2,
%U A257778 6,3,0,0,0,3,1,3,4,0,3,8,0,0,2,6,0,7
%N A257778 Smallest k, such that n is a Belgian-k number.
%C A257778 See A106039 for definition of Belgian-k numbers;
%C A257778 a(n) = A257770(n,0);
%C A257778 a(n) <= A257779(n); a(A257785(n)) = A257779(A257785(n));
%C A257778 conjecture: a(n) < 9;
%C A257778 a(A106039(n)) = 0; a(A257782(n)) > 0.
%H A257778 Reinhard Zumkeller, <a href="/A257778/b257778.txt">Table of n, a(n) for n = 0..10000</a>
%o A257778 (Haskell)
%o A257778 a257778 = head . a257770_row
%Y A257778 Cf. A106039, A257770, A257773, A257779, A257782.
%K A257778 nonn
%O A257778 0,15
%A A257778 _Reinhard Zumkeller_, May 08 2015