Survivor Odds?

I read somewhere that you have a 1 in 5,000 chance to hit 10 in a row but I cannot find the site.  Does anyone know the various odds of hitting 10; 15; 20 in a row?

The odds of a pure coin flip to come out heads 21 times in a row is 1 in 2.1 mil.  Figuring in that there is a bit of skill to picking teams and points are supposed to even that skill out, I would think that you are in the 1 in 2 million range....