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 can see that is divisible by 5.
. . But is it divisible by 7?