| math utils | |
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| problem | | last modified
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| 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 even-valued 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 3-digit 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 1000-digit 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 |