A 367 Antoine Verroken
Q1.
d(N,k) maximum
k N N d(N)
1 1 - 9
2 10 – 99 50 25
51 25
3 100-999 620 396
621 396
4 1000-9999 6310 4932
6311 4932
5 10000-99999 74210 56346
74211 56346
6 100000 – 99999 743210 620671
743211 620671
7 1000000 – 9999999 7532110 6628125
7532111 6628125
8 10000000 – 99999999 75432110 69204329
75432111 69204329
9 100000000 – 999999999 864322110 719743833
864322111 719743833
10 1000000000 – 9999999999 8654321110 7509238833
8654321111 7509238833
