Rowling in numbers...

There are a few numbers which have a striking recurrence in the Harry Potter series and here is a list of a few of them:

1. Number of books in the series
2. Years at Hogwarts
3. The Weasley Kids - William (Bill), Charlie, Percy, George, Fred, Ronald (Ron), Ginevra (Ginny)
4. Number of challenges to get to the Philosopher's stone
5. The known number of secret passages in and out of Hogwarts
6. Floor on which the Room of Requirement is located
7. The number of Potters who finally flew one last time over the Privet Drive
8. The number of Horcruxes Voldemort intended to make
9. Prophecy about the child born in the 7th month ...and many more...

1. The awesome trio - Harry, Hermione, Ron
2. The forbidden corridor in the first book
3. The number of heads of the Dog protecting the Philosopher's Stone
4. The number of Hallows
5. Name of the pub: The THREE Broomsticks
6. The faithful friends - Moony, Padfoot, Prongs
7. The Dumbledore kids - Albus, Aberforth, Adriana
8. Harry and Ginny's kids - James, Lily, Albus Severus   ...and many more...