math utils  

problem   last modified

problem_001  Add all the natural numbers below one thousand that are multiples of 3 or 5.
 20081018 
problem_002  Find the sum of all the evenvalued terms in the Fibonacci sequence which do not exceed four million.
 20081018 
problem_003  Find the largest prime factor of a composite number.
 20081018 
problem_004  Find the largest palindrome made from the product of two 3digit numbers.
 20081018 
problem_005  What is the smallest number divisible by each of the numbers 1 to 20?
 20081018 
problem_006  What is the difference between the sum of the squares and the square of the sums?
 20081018 
problem_007  Find the 10001st prime.
 20081018 
problem_008  Discover the largest product of five consecutive digits in the 1000digit number.
 20081018 
problem_009  Find the only Pythagorean triplet, {a, b, c}, for which a + b + c = 1000.
 20081022 
problem_010  Calculate the sum of all the primes below two million.
 20081022 
problem_011  What is the greatest product of four numbers on the same straight line in the 20 by 20 grid?
 20081028 