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A257778 Smallest k, such that n is a Belgian-k number. 6
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, 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, 6, 3, 0, 0, 0, 3, 1, 3, 4, 0, 3, 8, 0, 0, 2, 6, 0, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,15

COMMENTS

See A106039 for definition of Belgian-k numbers;

a(n) = A257770(n,0);

a(n) <= A257779(n); a(A257785(n)) = A257779(A257785(n));

conjecture: a(n) < 9;

a(A106039(n)) = 0; a(A257782(n)) > 0.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

PROG

(Haskell)

a257778 = head . a257770_row

CROSSREFS

Cf. A106039, A257770, A257773, A257779, A257782.

Sequence in context: A021761 A221960 A171839 * A242928 A214845 A071960

Adjacent sequences:  A257775 A257776 A257777 * A257779 A257780 A257781

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 08 2015

STATUS

approved

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Last modified April 12 18:58 EDT 2021. Contains 342932 sequences. (Running on oeis4.)