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

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

Offset: 0

Author

Reinhard Zumkeller, May 08 2015

Keywords

• nonn

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

Crossrefs

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

Programs

Haskell

a257778 = head . a257770_row