## November 2018 Fiendish Function

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

- 1
- 2
- 2
- 3
- 3
- 4
- 4
- 4
- 5
- 5
- 10
- 6

The rule was: "Write the number in binary, then add 2 to the power of the digits together".

Suppose the guess was 19:

- Write the number in binary, giving 10011.
- Take the number's digits, giving 1, 0, 0, 1, 1
- Take 2 to the power of each digit, giving 2, 1, 1, 2, 2
- Add these together, giving 8.

So the result is 8.

## Earlier answers

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