A050623 Smallest n-digit number divisible by 3^n.
3, 18, 108, 1053, 10206, 100602, 1001646, 10005525, 100009323, 1000053864, 10000125297, 100000190088, 1000000837998, 10000002002688, 100000000895004, 1000000037647854, 10000000032104772, 100000000321047720
Offset: 1
Formula
a(n) = 3^n*ceiling(10^(n-1)/3^n). - Vladeta Jovovic, Feb 14 2003