Question 1058638
What's the next number in the series?
4, 12, 13, 15, 14, 10, 11, 9 ...
---------
It's 8.
---
<rev>
0100 4
1100 12
1101 13
1111 15
1110 14
1010 10
1011 11
1001 9
1000 8
</rev>
It's Gray Code, or reflected binary code.
1 bit changes at each transition.
For the 4 bits:
0
1
3
2
6
7
5
4
C
D
F
E
A
B
9
8
then
18
19
1B
1A
1E
etc.