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Common Routines

This tag is associated with 29 posts

Project Euler 21 Solution

Evaluate the sum of all amicable pairs under 10,000.

Project Euler 23 Solution

Find the sum of all the positive integers which cannot be written as the sum of two abundant numbers.

Project Euler 24 Solution

What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?

Project Euler 26 Solution

Find the value of d < 1000 for which 1/d contains the longest recurring cycle.

Project Euler 35 Solution

How many circular primes are there below one million?

Project Euler 36 Solution

Find the sum of all numbers less than one million, which are palindromic in both base 10 and base 2.

Project Euler 37 Solution

Find the sum of all eleven primes that are truncatable from both left to right and right to left.

Project Euler 38 Solution

What is the largest 1 to 9 pandigital that can be formed by multiplying a fixed number by 1, 2, 3, … ?

Project Euler 43 Solution

Find the sum of all pandigital numbers with an unusual sub-string divisibility property.

Project Euler 47 Solution

Find the first four consecutive integers to have four distinct primes factors.