What's next?

4, 16, 37, 58, 89, 145, 42, ??

 What number will come in next place?

 Answer:

 20.
The series consists of numbers which follow the pattern:

42 = 16
12 + 62 = 37
32 + 72 = 58
52 + 82 = 89
82 + 92 = 145
12 +42 + 52 = 42
42 + 22 = 20

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