3
$\begingroup$

If you give me a 5, I give you a 21.
If you give me a 6, I give you a 2.
If you give me a 7, I give you a 12.
If you give me a 10, I give you a 101.

What am I processing to get the result?

Hint 1

If you give me a 3, I give you a 1.

Hint 2

This has some thing to do with a reversed 3.

Improve this question
$\endgroup$
1
  • $\begingroup$ Just to clarify, this is not a maths problem, it has just a bit to do with numbers. $\endgroup$
    – math scat
    Dec 18, 2020 at 17:52

1 Answer 1

Reset to default
7
$\begingroup$

It looks like the answer is

The number in base 3, with the digits reversed.

So 5 is

12 base 3, reversed is 21

6 is

20 base 3 reversed is 02 (drop the leading 0)

7 is

21 base 3, reversed is 12

And 10 is

101 base 3, same reversed.

Improve this answer
$\endgroup$
3
  • $\begingroup$ What????????????? In less than a minute? $\endgroup$
    – math scat
    Dec 18, 2020 at 17:55
  • 1
    $\begingroup$ Would have taken me longer without hint 2. I was mostly there anyway, but hint 2 just made it obvious. $\endgroup$
    – Joel Rondeau
    Dec 18, 2020 at 17:55
  • $\begingroup$ Sorry, can accept only in 10 minutes. $\endgroup$
    – math scat
    Dec 18, 2020 at 17:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.