The Task The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below two million. This task is so easy that it is almost not worth its own post. The reason is because it is identical to Task 7, "10001st prime" except...
The Task A Pythagorean triplet is a set of three natural numbers, a < b < c, for which a^2 + b^2 = c^2. For example, 32 + 42 = 9 + 16 = 25 = 52. There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product abc. Solutio...
Let's start the new PicoLisp Year 2022 with a little warm-up: The third task from the Project Euler which is a rather easy, but yet interesting challenge. Task description The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime fa...
Task description The Fibonacci sequence is a sequence Fn of natural numbers defined recursively: F0 = 0 F1 = 1 Fn = Fn-1 + Fn-2, if n>1 Write a function to generate the nth Fibonacci number. Solutions can be iterative or recursive (though recu...
The Task: If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000. As often with these kind of riddles, there is a stra...
Mathematics consists of proving the most obvious thing in the least obvious way. (George Pólya, Hungarian mathematician)
