# PRIME NUMBERS

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PRIME NUMBERS

History, theories and applications

By Kim

Wojtowicz

Slide2Definition of a Prime Number

A Prime number is a number that has exactly 2 Distinct factors: itself and 1.

Smallest prime number is 2, it is also the only even prime number.

Slide3Is 1 a Prime number?

There is argument and controversy about 1 being Prime.

Professor Ian

Mallett

states: DOES GOD THINK 1 Is Prime

Does God think that the number 1 is a prime number? A good question, which can be answered with just four basic responses.

1. Yes!

2. No! 1 is a separate and special entity called ‘Unity’. It is neither a prime nor a composite number. The first prime number is 2.

3a. It doesn’t matter, it’s just a question of definition.

3b. It doesn’t matter, I don’t believe in God.

4. What is a prime number?

In whatever category your reply falls, I’m sure you will benefit from reading this article so welcome to the site!

http://www.fivedoves.com/revdrnatch/Does_God_think_1_is_prime.htm

Slide4Dr. Mallet’s argument:

Prime numbers are far more important than composite numbers in the worlds of mathematics, the sciences, cryptography etc. Mathematicians, mistakenly in my view, often refer to prime numbers as being the building bricks of all numbers. The act of building is an additive process rather than a multiplicative one. You can’t build a wall and then multiply that wall by four to make a house. You just have to keep building, adding one brick at a time, until the house is completed. The building brick of all numbers therefore is the number 1. The number 1 is the brick that builds the number n, where each value of n is equal to the number ‘bricks’ required. The number 10 requires 10 bricks or 10 1’s, 20 requires 20 1’s etc. Nonetheless, great importance is assigned to the prime number series. So why the confusion over their order numbers? Why isn’t there universal agreement as to which is the first prime? Surely this issue is at least equal to, and probably far more important than, the order number of the composite numbers

Slide5Up until the beginning of the last century the general consensus was that 1 is prime, with just a few detractors. The French mathematician Henri

Lebesgue

was emphatic on this issue. The majority of mathematical textbooks in the 19

th

and early 20

th

centuries gave 1 as prime. Even now,

maths

textbooks as late as 1995 or later show 1 as being the first prime.

However, at the beginning of the last century mathematicians began to see the number 1 as a special case, isolating it from the primes and composites by calling it ‘unity’. It supposedly made things more ‘convenient’, an expression which I loathe because convenience doesn’t necessarily make a right and even now I still await an example of this so called ‘convenience’. The main opposition to the 1 is prime lobby is that it supposedly destroys that monolith of mathematics, the Fundamental Theorem of Arithmetic which states that every natural number is either prime or can be uniquely factored as a product of primes in a unique way - hmm, unique!

Well, in the first instance isn’t the number itself unique? Can something be doubly unique? Of course not! Since the number itself is unique it would be logical that its prime

factorisation

is different to that of any other number. I don’t think it matters a lot whether or not this theorem is destroyed but there is no need for it to be destroyed if 1 is considered prime. It all boils down to definition again. By the insertion of just two words the theorem still stands: the Fundamental Theorem of Arithmetic states that every natural number is either prime or can be factored as a product of prime proper factors in a unique way.

Slide6Dr. Mallet’s Conclusion

On a final note, how the idea that 1 is not prime destroys that beautiful Trinity of the first three primes 1, 2 and 3. The only triad of primes which are linked together, nothing in between, and the only primes whose order numbers are equal to their values. Uniquely, the product of these three is equal to their sum, i.e. 6, the 3

rd

triangle. This is the

gematria

of the Greek word ABBA meaning Father or Daddy. The first three primes 1, 2 and 3 represent the Trinity in terms of the order of the Father, Son and Holy Spirit.

Be not deceived dear reader, 1 is prime and God thinks so too!

Personal Note: from what we have learned, math and religion don’t mix.

Slide7History of Primes

Ishango bone: tool handle discovered around 1960 in the African area of Ishango, near Lake Edward. It has been dated to about 9,000 BC and was at first thought to have been a tally stick. At one end of the bone is a piece of quartz for writing, and the bone has a series of notches carved in groups on three rows running the length of the bone. The markings on two of these rows each add to 60. The first row is consistent with a number system based on 10, since the notches are grouped as 20 + 1, 20 - 1, 10 + 1, and 10 - 1, while the second row contains the prime numbers between 10 and 20! The Ishango bone is kept at the Royal Institute for Natural Sciences of Belgium in Brussels.

Slide8Who had knowledge of Primes?

Shown on

Ishango

bone

Hints that Egyptians knew from the

Rhind

Papyrus.

Ancient

chinese

writings show some knowledge

Not much done with it till the Greeks circa 300BC.

Slide9Who has researched it? Eratoshenes

http://www.together.in.th/find-prime-sequential-sieves-algorithm/http://www.cafepress.com/+mathematics_gifts_tshirts_organic_mens_tshirt_,412693392http://www.cafepress.com/+eratosthenes_prime_guy_mug,185245290

http://www.youtube.com/watch?v=0JHEqBLG650&NR=1&feature=fvwp

http://www.youtube.com/watch?v=3mrVyVBTYNc&feature=related

Slide10Competition for Erosthenes

Arthur Oliver Lonsdale

Atkin

(July 31, 1925 – December 28, 2008), who published under the name

A. O. L.

Atkin

, was a

Professor Emeritus

of

mathematics

at the

University of Illinois at Chicago

. As an

undergraduate

during

World War II

, he worked at

Bletchley Park

cracking

German

codes.

[1]

He received his

Ph.D.

in 1952 from the

University of Cambridge

, where he was one of

John

Littlewood

's

research students.

[2]

Atkin

, along with

Noam

Elkies

, extended

Schoof's

algorithm

to create the

Schoof–Elkies–Atkin

algorithm

and, together with

Daniel J. Bernstein

, developed the

sieve of

Atkin

.

Slide11Sieve of Atkin

In the algorithm:

All remainders are

modulo-sixty remainders

(divide the number by sixty and return the

remainder

).

All numbers, including

x

and

y

, are whole numbers (positive integers).

Flipping an entry in the sieve list means to change the marking (prime or nonprime) to the opposite marking.

Create a results list, filled with 2, 3, and 5.

Create a sieve list with an entry for each positive whole number; all entries of this list should initially be marked nonprime.

For each entry number

n

in the sieve list, with modulo-sixty remainder

r

:

If

r

is 1, 13, 17, 29, 37, 41, 49, or 53, flip the entry for each possible solution to 4

x

2

+

y

2

=

n

.

If

r

is 7, 19, 31, or 43, flip the entry for each possible solution to 3

x

2

+

y

2

=

n

.

If

r

is 11, 23, 47, or 59, flip the entry for each possible solution to 3

x

2

−

y

2

=

n

when

x

>

y

.

If

r

is something else, ignore it completely.

Start with the lowest number in the sieve list.

Take the next number in the sieve list still marked prime.

Include the number in the results list.

Square the number and mark all multiples of that square as nonprime.

Repeat steps five through eight.

This results in numbers with an odd number of solutions to the corresponding equation being prime, and an even number being nonprime.

Slide12Study/Theorems of Primes:Just to name a few

Fermat

: infinitely many primes.

Gauss

:The

problem of distinguishing prime numbers from composite numbers and of resolving the latter into their prime factors is known to be one of the most important and useful in arithmetic.

Euclid

:fundamental

Theorem of Arithmetic

Riemann

: distribution of primes

Goldbach

:

Every even number >2 can be expressed as the sum of 2 primes.

Slide13Types of Primes

Twin Primes

: primes differ by 2

Mersinne

Primes

:

descibe

Mn

= 2 ^ ( n) -1

Fermat Primes:

Fn = 2^ (2n) + 1

Prime Quadruplet:

A

prime constellation

of four successive

primes

with minimal distance . The term was coined by Paul

Stäckel

(1892-1919

Wieferich

primes

: prime p such that p squared divides 2^ ( p-1) -1

Wall-Sun-Sun Primes:

if p squared divides F(p-p/5)

Wilson Prime

: p squared divides ( p-1)!

Slide14Prime Calculators

http://primes.utm.edu/curios/includes/primetest.php

http://www.amblesideprimary.com/ambleweb/primenumber/primecheck.htm

Many others found on the internet

Slide15Largest known Prime

In 2008 the largest known prime to date was found.

http://primes.utm.edu/notes/by_year.html

Prime of record size:

http://primes.utm.edu/notes/1257787.html

Slide16Uses/applications of Primes

http://www.odec.ca/projects/2007/fras7j2/uses.htm

Used for cryptography /insects

http://math.dartmouth.edu/~carlp/PDF/extraterrestrial.pdf

finding extraterrestrials

What is the best use of primes?

http://answers.yahoo.com/question/index?qid=20090213173906AAgAYxy

Slide17Music of the Primes

Olivier Messiaen, a famous composer found a great use for prime numbers in his music: Messiaen used both a 17 and 29 sequence in his piece of music Quartet for the End of Time. Both motifs start at the same time, however, since they are both prime numbers, the same sequence of notes playing together from each sequence wont be the same until they have played through 17 x 29 times each. He held prime numbers very close to his heart and believed they gave his music a timelessness quality.

Slide18Primes In Nature

Similarly, the cicada, a burrowing insectowes its survival to prime numbers and their properties. The cicada lives underground for 17 years, making no sound or showing any signs for this amount of time. After 17 years, all of the insects appear in the forest for just six weeks to mate before dying out.

Slide19Uses: Code Breaking

Prime numbers assist us in internet banking, shopping and general interaction on the internet. It encodes the messages.

Ex: RSA calculator:

http://www.cs.drexel.edu/~jpopyack/IntroCS/HW/RSAWorksheet.html

Slide20Prime Numbers In Code Breaking

To encode a message…

If we want to send the message “HELLO” we simply convert it into a

string of numbers:

0805121216

(A=01, B=02… etc.)

We can then raise that number to a publicly announced power, divide it

by another number which has again been publicly announced and we

will be left with a remainder. This is our encoded message…

Slide21Prime Numbers In Code Breaking

To decode this message…

The person who received the coded string of numbers

would raise that number to another power which

would only be known to them. They then divide it

again by the number publicly announced earlier and

the remainder from that would be the string of

numbers that break down to say “HELLO”!

Slide22Prime Numbers In Code Breaking

For Example…

Let our message be “E”. “E” is converted to 05, and is then

raised to the 7

th

power

.

Our number is now 78,125. We divide that number by

33

to give 2367 with a

remainder

of 14.

14 is our encoded message.

Slide23Prime Numbers In Code Breaking

Now, to decode…

We raise 14 to the 3

rd

power to give 2744. We divide

that number by 33 which gives 83 with a remainder of

5…

5 is our decoded message and converts to “E”, the

original message.

Slide24Fun time!

Now if time, a little fun with Relatively primes?

Slide25Prime Number excercise

You take all people from a group, or all your class students and put them in a circle.

Then count the number of students and pick a number “RELATIVELY PRIME to it” meaning that both numbers don’t have to be prime, they just need to share NO Factors

Slide26Game continued

Example: lets say we have 20 students, and you pick the number 3. You give a Tennis ball to student 1 and they throw the ball around to every 3

rd

person. It will Take 3 rotations, but in these 3 rotations the ball will come to each student 3 times, touching them all just once and then returning to where it started.

You make it tougher by adding a new tennis ball to the circle

everytime

the ball passes to the 3

rd

person start another ball going. 20 people should be able to handle 9 tennis balls (( # people/2 ) – 1)

Slide27On paper.

You can do the same designs on paper as the game. Using a ruler, compass and carefully spacing out the dots connect them and create spirals and other designs. You will see as the two numbers get closer the angles shrink and the picture narrow. For our example to 20 you could use 20/3 and 20/7 and 20/9 .

Slide28On paper

On paper it gives wonderful designs for 2 number not relatively prime. For example pick 20/2 you will get 2 decagons that intertwine. 20/5 will give you 5 intertwining squares while 20/4 will give 4 intertwining decagons.

Formula ( points / n where points and n are not relatively prime) gives n intertwining shapes of sides (point/n).

Slide29Resources

Does god think 1

is prime:

http://

www.fivedoves.com/revdrnatch/Does_God_think_1_is_prime.htm

Internet encyclopedia

of science:

http://

www.daviddarling.info/encyclopedia/P/primenumber.html

RSA

encryption calculator:

http://www.cs.drexel.edu/~

jpopyack/IntroCS/HW/RSAWorksheet.html

Wikipedia

:

http

://

en.wikipedia.org/wiki/Prime_numbers

Prime curious:

http://

primes.utm.edu/curios/includes/primetest.php

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