The number 6 has four different factors,1,2,3,6.What is one possible two digit integer that has exactly three different positive factors?

# Win a Math Guide by being first to answer this challenge question correctly

It’s exciting times around PWN HQ—lots of things going on. 2014 should be a fun year for SAT prep. That has nothing to do with this contest, of course. I just like to open these contest posts with a little friendly chatter. I bet nobody even reads this stuff. :/ ANYWAY, here’s a challenge question! (more…)

# Prime factorization and the SAT

So this isn’t a super important thing as far as how often it appears on the SAT, but it does pop up time and again, so if you’re shooting for perfection (or close to it) you might want to pay attention. Otherwise, you can get by just fine without this little nugget (but you might (more…)