Numbers trivia
More Numbers Trivia
Arithmetic, prime numbers, Pi, and Fibonacci sequences.
Numbers Mini Quiz
Test your knowledge with these top questions!
Which mathematical proportion appears frequently in seashells and Renaissance art?
The golden ratio, or phi, is approximately 1.618 and is often associated with the spiral growth of seashells and the balanced compositions of artists like Leonardo da Vinci.
What is the smallest prime number?
The smallest prime number is 2 because it is the only even prime number. All other even numbers can be divided by 2.
Which ancient librarian created a "sieve" method to identify prime numbers?
Eratosthenes, the chief librarian of the Library of Alexandria, created his sieve to identify primes by crossing out multiples. He also calculated the Earth's circumference.
Which Greek mathematician proved that the list of prime numbers goes on forever?
Euclid's proof appears in Book IX of the Elements, written around 300 BC. He showed that for any finite set of primes, a prime factor exists that is not in that set.
Which technology field uses large primes to secure sensitive online data?
Cryptography relies on the difficulty of factoring the product of two large primes. Multiplying them is easy, but reversing the process would take billions of years.
Which French monk names primes that are exactly 1 less than a power of 2?
For 2^n - 1 to be prime, the exponent n must also be prime. These numbers are used to discover the largest known primes and are linked to even perfect numbers.
Which mathematician proposed that every even number above 2 is the sum of 2 primes?
Goldbach proposed this in a 1742 letter to Leonhard Euler. While verified for numbers up to 4 quintillion, it remains one of the oldest unsolved problems in number theory.
Which letter represents the base of the natural logarithm?
Leonhard Euler introduced the letter e for this constant in the 1730s. It is an irrational number approximately equal to 2.71828 and is the base of natural growth functions.
Which letter represents the square root of negative 1?
Leonhard Euler introduced the symbol i for the imaginary unit in 1777. Electrical engineers use j instead to avoid confusion with the symbol for electric current.