Almost Prime Numbers

Almost prime numbers are the non-prime numbers which are divisible by only a single prime number. In this problem your job is to write a program which finds out the number of almost prime numbers within a certain range. Input First line of the input file contains an integer N (N ≤ 600) which indicates how many sets of inputs are there. Each of the next N lines make a single set of input. Each set contains two integer numbers low and high (0 < low ≤ high < 1012). Output For each line of input except the first line you should produce one line of output. This line contains a single integer, which indicates how many almost prime numbers are within the range (inclusive) low...high. Sample Input 3 1 10 1 20 15 Sample Output 3 4 1