5. Write down the 0 times, 1 times, 2 times, 3 times, 4 times, 5 times, ... of the natural number 15 in order: $0, 15, 30, 45, 60, 75, \ldots$

This sequence of numbers can go on indefinitely, and each subsequent number is always larger than the previous one. Any natural number is either one of these numbers or lies between two adjacent numbers. We call this sequence a strictly increasing infinite sequence. Each number from left to right is called the first term, the second term, the third term, ..., i.e., the first term is 0, the second term is 15, the third term is $30, \ldots$, and so on. Therefore, the number that lies between the 135th term and the 136th term of this sequence, and whose difference with the smaller of these two terms is 6, is


$2016$