How is this a number sequence $58, 26, 16, 14, 10$ I recently had a IQ Test taken and we all got stuck on the same question. The question was:

What comes next in the following sequence?
$$58, 26, 16, 14,\_\_$$

The answer given in the answer sheet was $10$. My question is why? What pattern exists in those numbers?
$5+8 = 13$ and twice $13$ is $26$, etc.
I got 13.5

2^5 = 32
2^3 = 8
2^1 = 2
2^(-1) = 1/2

58 - 2^5 = 26
26 - 2^3 = 16
16 - 2^1 = 14
14 - 2^(-1) = 13.5