A series of lockers, numbered 1 through 100, are all initially closed. Student 1 goes through and opens every locker. Student 3 goes through and "flips" every 3rd locker ("flipping") a locker means changing its state: if the locker is open he closes it, and if the locker is closed he opens it). Thus, Student 3 will close the third locker, open the sixth, close the ninth. . . . Student 5 then goes through and "flips"every 5th locker. This process continues with all students with odd numbers $n<100$ going through and "flipping" every $n$th locker. 

How many lockers are open after this process?
1. **Initial Setup**: We have 100 lockers, all initially closed. Each student with an odd number \( n \) (where \( n < 100 \)) will flip every \( n \)-th locker.

2. **Understanding the Flipping Process**:
   - Student 1 opens every locker.
   - Student 3 flips every 3rd locker.
   - Student 5 flips every 5th locker.
   - This continues for all odd-numbered students up to 99.

3. **Determining the State of Each Locker**:
   - A locker will be flipped every time a student whose number is a divisor of the locker number passes by.
   - For example, locker 12 will be flipped by students 1, 3, and 4 (since 1, 3, and 4 are divisors of 12).

4. **Counting the Number of Flips**:
   - A locker will end up open if it is flipped an odd number of times.
   - A locker will end up closed if it is flipped an even number of times.

5. **Odd Number of Divisors**:
   - A number has an odd number of divisors if and only if it is a perfect square. This is because divisors generally come in pairs, except when the number is a perfect square (e.g., 36 has divisors 1, 2, 3, 4, 6, 9, 12, 18, 36, where 6 is repeated).

6. **Identifying Perfect Squares**:
   - We need to identify all perfect squares between 1 and 100.
   - The perfect squares in this range are: \(1^2, 2^2, 3^2, 4^2, 5^2, 6^2, 7^2, 8^2, 9^2, 10^2\).
   - These are: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100.

7. **Conclusion**:
   - There are 10 perfect squares between 1 and 100.
   - Therefore, there will be 10 lockers that remain open after all the students have passed.

\[
\boxed{10}
\]