Question

Number that best completes sequence 3 9 4 5 25 20 21 441

Answer 1

The pattern is to square the number, then subtract 5, then add 1. And repeat.
1) 3 x 3 =9
2) 9 - 5 = 4
3) 4 + 1 = 5
4) 5 x 5 =25
5) 25 - 5 = 20
6) 20 + 1 = 21
7) 21 x 21 = 441
8) 441 - 5 = 436
The answer is 436