Numbers

You can search the properties of numbers, pairs of two or three positive integers and sequences in @QED. If you enter an integer in the search form, @QED shows its divisors and factorization and properties of it such as whether it's a prime number, perfect number or Mersenne number. You can get the average, sum of squares and geometric mean of two or three positive integers by inputting them separated by spaces.

Integers

Pairs of two integers

Pairs of three integers