Braingle Lite



4, 12, 84, ...

Category:Series
Submitted By:bluelightnign
Fun:*** (2.25)
Difficulty:**** (3.1)



What is the next number in this series?

4, 12, 84, 3612....

Answer:

6526884. To get from 4 to 12, you use the following formula. 12 = (4 squared)/2 + 4.

Continue on with (X^2)/2 + X.

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