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Browse High School Number Theory
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Diophantine equations.
    Infinite number of primes?
    Testing for primality.
    What is 'mod'?



Factorial Base and Base 10 [11/02/2001]
Let n be a number written in base 10, which also has an interpretation in factorial base. Let m be the value of its interpretation in factorial base. What is the greatest n for which m is equal to or less than n?

Factorials Can't Be Squares [02/11/2000]
Can you prove that the factorial of a number (greater than 1) can never be a perfect square?

Factoring [02/09/1999]
Find the smallest number (integer) that has 30 factors.

Factoring 13 with Complex Numbers [08/11/1998]
How do you show that 13 is not prime using imaginary numbers? We know that 13 = (3 + 2i)(3 - 2i), but how do you do this in general?

Factoring Large Numbers [10/26/1998]
Can you give me an algorithm for factoring large numbers? What about the Pollard Rho Factoring Algorithm?

Factoring Large Numbers [05/26/2000]
How can you use Fermat's Little Theorem to factor large numbers?

Farey Series [10/21/2002]
For three successive terms in a Farey's series, say a/b, c/d, e/f, how can we prove independently that c/d = (a+e)/(b+f) and ad-bc = -1 ?

Fermat Number Proof [01/30/2001]
Prove that if n is greater than 0, then the Fermat number 2^2^n + 1 is of the form 9k-1 or 9k-4. Prove that n and 2^2^n + 1 are relatively prime for every n greater than 0.

Fermat's Factorization Method [01/29/1999]
Can you describe Fermat's method of factoring an integer?

Fermat's Last Theorem for n = 3 [12/14/1998]
What is the proof for Fermat's Last Theorem where n = 3? Who is given credit for the first proof for this case?

Fermat's Last Theorem with Negative Exponents [10/26/2000]
Are there any solutions of Fermat's Last Theorem, x^n + y^n = z^n, for n less than 2?

Fermat's Little Theorem [09/02/2000]
Can you help me prove Fermat's Little Theorem, that the expression n^p-n, where p is an arbitrary prime and n is a positive integer, is always divisible by p?

Fermat's Little Theorem and Prime Numbers [09/28/1998]
Please explain how to use Fermat's Little Theorem to test whether a number is composite.

Fermat's Little Theorem: A Special Case [06/26/2001]
Show that n^7-n is divisible by 7.

Fermat's Theorem [01/21/1998]
Why was Fermat's Theorem such a mystery?

Fibonacci Formula Inductive Proof [11/05/1997]
I must prove by induction that F(n) = (PHI^n - (1 - PHI)^n) / sqrt5...

Fibonacci-GCD Proof [11/20/2002]
Can you help me prove that fib(gcd(m, n)) = gcd(fib(m), fib(n)) ?

Fibonacci Identity [12/10/2001]
I am trying to create an inductive proof for the particular identity of Fibonacci numbers that: F(n-1) * F(n+1) = (-1)^n + (Fn)^2.

Fibonacci or Lucas Number [02/19/2003]
How do I know that any number x is a Fibonacci or Lucas number?

Fibonacci Proof [01/29/2001]
This proof is giving me major problems: F(2n) = (F(n))^2 + (F(n-1))^2. ...

Fibonacci Sequence [01/29/2001]
Is there a formula for the n-th Fibonacci number?

Fibonacci Sequence Property [11/29/2001]
I have to prove that in the Fibonacci sequence, F(k) is a divisor of F(nk), where n is a natural number (so, F(nk) = A*F(k) where A is a natural number).

Fibonacci Sequences [01/08/1998]
Please help me with a proof.

Fibonacci's Liber Quadratorum - Proposition 18 [04/07/2002]
Prove by contradiction that if any two positive integers have an even sum, then the ratio of their sum to their difference will not be the same as the ratio of the larger number to the smaller.

Find a, b, c, Such That a! b! = a! + b! + c! [12/09/2003]
Find all triples of nonnegative integers a, b, c such that a! b! = a! + b! + c!

Finding 13^99 [11/21/2001]
What is the units digit of 13 to the 99th power?

Finding a Desired Perfect Cube [04/26/2007]
What is the smallest positive cube that ends with the digits 2007?

Finding A Number Given Its Divisors and Remainders [10/22/2003]
A general strategy for solving problems such as finding the smallest whole number that when divided by 5, 7, 9, and 11 gives remainders of 1, 2, 3, and 4 respectively.

Finding a Number Given the Sum of Its Factors [10/19/2007]
The factors of an unknown number add up to 91. Is there a way to find the number without having to just use trial and error?

Finding a Remainder [09/21/2007]
When the even integer n is divided by 7, the remainder is 3. What is the remainder when n is divided by 14?

Finding a Series Given the Sum [09/27/1999]
How can I find all series of consecutive integers whose sum is a given value x?

Finding a Set of Consecutive Odd Integers That Sum to a Given Number [02/21/2004]
Given a number n, which is the sum of some set of consecutive odd numbers, is there an efficient way to find the set of odds that generate the sum?

Finding Catalan Numbers [12/15/1999]
What are Catalan numbers and what applications do we have for them?

Finding Divisibility Rules for Large Numbers [12/21/2000]
Is there any system for finding divisibility rules for any number?

Finding Formulas for Number Sequences [11/22/1997]
My question is about trying to find a formula between numbers.

Finding Howlers [10/25/1999]
Howlers are fractions like 16/64; when you cross out the 6 on the top and the bottom, you are left with 1/4, which is the simplified fraction. How can I find all 2-digit, 3-digit and 4-digit howlers?

Finding Integer Pairs Whose Product Consists Only of 1's and 0's [10/06/2004]
Given the base-10 representation of any integer a, does there exist a non-zero integer b such that the base-10 representation of the product ab contains only ones and zeros?

Finding Integer Solutions to a^b = b^a [02/02/2005]
Find all positive integers a and b such that a^b = b^a, and prove that you have found them all.

Finding Mersenne Primes [02/15/2002]
How do I find the first four Mersenne primes?

Finding N Consecutive Composite Numbers [02/26/2001]
How can I find N-1 consecutive numbers that are not prime for any number N greater than 1?

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