Hailstone numbers


 

Start with a random number.

 

If it is even then divide by 2.

 If it is odd, multiply by 3 and add 1.

 

 If you keep going you will find that no matter where you started you will eventually hit 1. Like hailstones, the

number will go up, and inevitably come back down. This is an example with 7:

 

7, 22, 11, 34, 17, 52, 26, 13, 40, 20, 10, 5, 16, 8, 4, 2, 1

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