It wasn’t possible for Green and Sawhney to directly count the number of primes made by squaring two other primes and adding them together. But what if they loosened their constraint just a bit?

For more than 25 years, prominent researchers in early childhood math education have been promoting subitizing as something that schools should be teaching to build number sense. According to their ...

To do so, they ended up making a surprising connection to another area of math. It wasn’t possible for Green and Sawhney to directly count the number of primes made by squaring two other primes and ...