April 2018 Fiendish Function

The Fiendish Function posed during April 2018 had the following sample guesses and replies:

• GUESS
• REPLY
• 1
• 1
• 2
• -4
• 3
• -19
• 4
• -48
• 5
• -93
• 10
• 24

The rule was: "Cube the number, then subtract from two to the power of the number".

Suppose the guess was 13:

• Cube the number, giving 2197.
• Calculate two to the power of the number, giving 8192.
• Subtract the number from this, giving 5995.

So the result is 5995.