Board Thread:Fun & Games/@comment-25300095-20150308141501/@comment-25825221-20150319170229

Let's see... is $$477$$ prime?

2: No, odd

3: 4+7+7 = 18.

Dividing 477 by 3... $$\frac {477} 3 = 159$$

2: No, odd

3: 1+5+9 = 18.

Dividing 159 by 3... $$\frac {159} {3} = 53$$

53 is prime. Therefore...

$$477 = 3^2 \cdot 53$$