The an initial five prime numbers: 2, 3, 5, 7 and also 11.

A prime number is one integer, or entirety number, that has only two factors — 1 and itself. Put another way, a prime number have the right to be separated evenly just by 1 and also by itself. Element numbers likewise must be greater than 1. Because that example, 3 is a prime number, due to the fact that 3 can not be split evenly by any number other than for 1 and also 3. However, 6 is not a prime number, because it deserve to be divided evenly by 2 or 3.

You are watching: Can a prime number be a multiple of any number except itself


biggest prime number

The largest prime number discovered so much is 2 raised to the 57,885,161st strength minus 1, or 257,885,161 - 1. That is 17,425,170 digits long. The was uncovered by college of main Missouri mathematician Curtis Cooper as component of a gigantic network the volunteer computers dedicated to detect primes.

history of element numbers

Prime numbers have been learned for thousands of years. Euclid\"s \"Elements,\" published around 300 B.C., proved several results around prime numbers. In publication IX of the \"Elements,\" Euclid writes the there are infinitely many prime numbers. Euclid likewise provides evidence of the an essential Theorem the Arithmetic — every integer have the right to be created as a product that primes in a distinct way. In \"Elements,\" Euclid solves the difficulty of exactly how to produce a perfect number, i beg your pardon is a hopeful integer same to the amount of its hopeful divisors, using Mersenne primes. A Mersenne element is a element number that deserve to be calculated v the equation 2n-1.


This grid deserve to be supplied as a Sieve of Eratosthenes if you were to overcome out every one of the numbers that space multiples of various other numbers. The prime numbers space underlined. (Image credit: Ray49 Shutterstock)

In 200 B.C., Eratosthenes developed an algorithm that calculated element numbers, known as the Sieve of Eratosthenes. This algorithm is just one of the more quickly algorithms ever before written. Eratosthenes placed numbers in a grid, and also then crossed out all multiples the numbers until the square source of the largest number in the network is overcome out. Because that example, with a grid of 1 come 100, you would cross the end the multiples that 2, 3, 4, 5, 6, 7, 8, 9, and also 10, due to the fact that 10 is the square source of 100. Because 6, 8, 9 and 10 room multiples of various other numbers, you no much longer need come worry around those multiples. So for this chart, you would certainly cross out the multiples the 2, 3, 5 and 7. Through these multiples overcome out, the only numbers the remain and also are no crossed out room prime. This sieve enables someone come come up with large quantities of element numbers.

But during the Dark Ages, as soon as intellect and science were suppressed, no more work was done v prime numbers. In the 17th century, mathematicians prefer Fermat, Euler and also Gauss began to research the patterns that exist within element numbers. The conjectures and theories placed out by mathematicians in ~ the time reinvented math, and also some have yet to be proven to this day. In fact, proof of the Riemann Hypothesis, based upon Bernhard Riemann\"s theory about patterns in prime numbers, tote a $1 million compensation from the Clay mathematics Institute.

element numbers & encryption

In 1978, 3 researchers discovered a way to scramble and unscramble coded messages making use of prime numbers. This early kind of encryption led the means for web security, putting prime number at the love of electronic commerce. Public-key cryptography, or RSA encryption, has simplified secure transactions of all times. The security of this form of cryptography depends on the difficulty of factoring huge composite numbers, which is the product the two big prime numbers.

Confidence in modern banking and commerce equipment hinges ~ above the assumption that huge composite numbers cannot be factored in a short amount that time. 2 primes are taken into consideration as saturated secure if they space 2,048 bits long, since the product the these two primes would certainly be around 1,234 decimal digits.

prime numbers in nature

Prime numbers even show up in nature. Cicadas spend many of their time hiding, just reappearing come mate every 13 or 17 years. Why this certain number? researchers theorize that cicadas blee in cycles the minimize possible interactions through predators. Any kind of predator reproductive cycle that divides the cicada\"s bicycle evenly way that the predator will certainly hatch out the same time together the cicada at part point. Because that example, if the cicada developed towards a 12-year reproductive cycle, predators that reproduce in ~ the 2, 3, 4 and 6 year intervals would uncover themselves with plenty the cicadas come eat. By using a reproductive cycle v a prime variety of years, cicadas would be able to minimize contact with predators.

See more: Where Can One Read The Maximum Ride Manga 1 Read Online Free

This might sound implausible (obviously, cicadas don\"t know math), but simulation models the 1,000 year of cicada advancement prove the there is a significant advantage for reproductive bicycle times based upon primes. It can be viewed here at It might not it is in intentional ~ above the part of mom Nature, but prime numbers display up an ext in nature and also our surrounding human being than we may think.