Tag: math & puzzles

Since every even number is divisible by 2, there are no even prime numbers.

The number 12 has 6 factors: 1, 2, 3, 4, 6, and 12. If you add up those factors you will get 28. Because of this fact, and the special properties of 6 and 28, the number 12 is called a _______ number.

What is extremely special about these two numbers: 220 and 284? They are ______ pairs.

This kind of number is divisible by only one and itself. The first few examples are 2, 3, 5, 7, and 11.

What is the set of positive numbers that results in whole numbers when raised to the power of one-half?

What is the name for the type of number that cannot be written as a ratio of two integers?

This kind of number is equal to the sum of its positive factors, excluding itself. The first 3 examples are 6, 28, and 496.

Real numbers are rational, irrational, whole, and imaginary.

The numbers 3, 7, 31, and 127 are what?

What group of numbers does the letter "i" represent?