September 2015 Fiendish Function
The Fiendish Function posed during September 2015 had the following sample guesses and replies:
- 1
- 1
- 2
- 3
- 3
- 6
- 4
- 1
- 5
- 6
- 10
- 7
The rule was: "Add my previous answer to the number, then add the digits together".
Suppose the guess was 13:
- Add my previous answer to the number.
For example, if my previous answer was 10 this gives 23.
- Find the number's digits, giving 2, 3
- Add these together, giving 5.
So the result is 5.
Earlier answers
Here are the answers to the Fiendish Functions posted in earlier months: