July 2016 Fiendish Function
The Fiendish Function posed during July 2016 had the following sample guesses and replies:
- 1
- -1
- 2
- -2
- 3
- -2
- 4
- 8
- 5
- 88
- 10
- 3627776
The rule was: "Take the factorial of the number, then subtract two to the power of the number".
Suppose the guess was 13:
- Find 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1, giving 6227020800.
- Calculate two to the power of the number, giving 8192.
- Subtract this, giving 6227012608.
So the result is 6227012608.
Earlier answers
Here are the answers to the Fiendish Functions posted in earlier months: