Mr. Peanut has a ten-digit telephone number (including the area code) in which each digit, 0 through 9, appears once. The first digit on the left is divisible by 1, the first two digits form a number divisible by 2, the first three digits form a number divisible by 3, the first four digits form a number divisible by 4, and so on, until we get to the whole 10-digit number which is divisible by 10. What is Mr. Peanut's phone number?

Hint: Make a chart with 10 blank spaces. Use what you know about divisibility rules to decide which numbers can go in each blank. Then, try to find all the possible combinations. Remember, each digit (0-9) must be used ONLY once. Post your reasoning in the comments below.

Hint: Make a chart with 10 blank spaces. Use what you know about divisibility rules to decide which numbers can go in each blank. Then, try to find all the possible combinations. Remember, each digit (0-9) must be used ONLY once. Post your reasoning in the comments below.