July 2018 Fiendish Function
The Fiendish Function posed during July 2018 had the following sample guesses and replies:
- 1
- 1
- 2
- 5
- 3
- 10
- 4
- 21
- 5
- 26
- 10
- 130
The rule was: "Add the squares of the number's divisors together".
Suppose the guess was 15:
- Find the number's divisors, giving 1, 3, 5, 15
- Square them, giving 1, 9, 25, 225
- Add these together, giving 260.
So the result is 260.
Earlier answers
Here are the answers to the Fiendish Functions posted in earlier months: