Coffee, Please!

Sandy Wood

Today's Think Thursday Brain Game challenge is one we first offered, oh, about four years ago. Let's see if it's improved with age:

What's the next number in this sequence? 2, 3, 10, 12, 13, 20, 21, ?, ...

Here is my SOLUTION. 


22. They're the whole numbers that, when spelled out, begin with the letter "T."

Thanks for playing!