Math Trivia brings the fun into math problems. TriviaQN has a range of math trivia for beginners and the elite. Math trivia can be a part of family game night and even help to brush up on your math skills.

## Challenge yourself with a Math Trivia Quiz!

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### How many obvious/trivial factors does a natural number N have?

The positive +1 and +N and the negative -1 and -N.

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### Is 8128 a perfect number?

Adding up the divisors of 8128: 1 + 2 + 4 + 8 + 16 + 32 + 64 + 127 + 254 + 508 + 1016 + 2032 + 4064 = 8128

Easy

### What is Natalie Portman's Erdős number?

Portman collaborated (using her birth name, Natalie Hershlag) with Abigail A. Baird, who has a collaboration path (Gazzaniga, Michael S. -> Victor, Jonathan D.) leading to Joseph Gillis, who has an Erdős number of 1.

Medium

### What number comes next: 1, 11, 21, 1211, 111221, ...?

John Conway's "look and say" sequence has no digits other than 1, 2, and 3 in it, unless the seed number contains such a digit or a run of more than three of the same digit. A degenerate sequence appears with the seed of 22.

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### Is 36 a perfect number?

Adding up the divisors of 36: 1 + 2 + 3 + 4 + 6 + 9 + 12 + 18 = 55

Easy

### What is a positive integer that is equal to the sum of its proper positive divisors (excluding the number itself) called?

You might also think of a perfect number as a number that is half the sum of all of its positive divisors, including itself! This definition is at least 2300 years old as it appears in Euclid's "Elements".

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