See also the Dr. Math FAQ: 0.9999 = 1 0 to 0 power n to 0 power
0! = 1 dividing by 0 Browse High School Number Theory Stars
indicate particularly interesting answers or good places to
begin browsing. Selected answers to common questions: Infinite
number of primes? Testing for primality. What is 'mod'? - Prime
Number Theorems [01/03/1999] Can you explain the prime number
theorem, Mersenne primes, the Lucas- Lehmer test, and the
Riemann Hypothesis? - Prime Proofs [10/08/2002] If a^(n) - 1 is
prime, show that a=2 and that n is a prime. If a^(n) + 1 is a
prime, show that a is even and that n is a power of 2. - Primes
and Repeating Unit Numbers [12/09/1998] How do you prove this
statement: For every prime number there exists a repeated unit
number that is a multiple of that prime. - Primes and Squares
[05/03/2001] For what values of prime number p is (2^(p-1)-1)/p
a perfect square? - Primes Containing but Not Ending in
123456789 [02/26/2003] Are there infinitely many primes that
contain but do not end in the block