Hello, nacknack!

Are these base-15 numbers divisible by each of and ?

. .

Hint: consider divisibility by factors (not necessarily prime) of and

I'm allowed to convert and to base 10 to find their factors.

We have: .

But I don't see how this helps.

We would need some divisibility theorems for base-15, wouldn't we?

For example, I canthat is divisible by 5.see

. . But is it divisible by 7?