What is the sum of all 4 digit numbers that can be formed by the digits 0, 1, 2, 3, 4? No repetitions allowed.
A man counts numbers and skips the numbers that have digits divisible by 3. The first ten numbers are 1, 2, 4, 5, 7, 8, 11, 12, 14, 15. What is the 100th number?