Find the next number in the series 4 8 12 20 --?

Answer 1

There is a "Fibonacci" like series is that each digit is the sum of the preceding two numbers:

4 + 8 = 12

8 + 12 = 20

So the series continues:

12 + 20 = 32

20 + 32 = 52

32 + 52 = 84

52 + 84 = 136

and so on.

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What number do you want to be next?

Give me a number and I'll give you a polynomial so that putting in 1, 2, 3, 4 gives the values 4, 8, 12, 20 and putting in 5 gives the number you want.

Answer 2

32

Answer 3

32