## May 2017 Fiendish Function

The Fiendish Function posed during May 2017 had the following sample guesses and replies:

- 1
- 4
- 2
- 15
- 3
- 40
- 4
- 85
- 5
- 156
- 10
- 1111

The rule was: "Cube the number, add the original number squared, add the original number, then add one".

Suppose the guess was 13:

- Cube the number, giving 2197.
- Add the original number squared, giving 2366.
- Add the original number, giving 2379.
- Add one, giving 2380.

So the result is 2380.

## Earlier answers

Here are the answers to the Fiendish Functions posted in earlier months: