Kitty has one million marbles, which are numbered from 1 to 1,000,000. Marbles with equal digit sums have the same color and marbles with different sums have different colors. How many different colors of marbles does Kitty have?
Kitty has one million marbles, which are numbered from 1 to 1,000,000. Marbles with equal digit sums have the same color and marbles with different sums have different colors.