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The Problem: What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, ...

The Problem: A perfect number is a number for which the sum of its proper divisors is exactly eq...

The Problem: Get the total sum of a file of names if each letter in the name is mapped from 1-26...

The Problem: Let d(n) be defined as the sum of proper divisors of (numbers less than n which div...

The Problem: What is the sum of the digits of 100! where n! means 1x2x3x4x...xn? Considerations...

The Problem: How many Sundays fell on the first of the month between Jan 1 1901 and Dec 31 2000?...

The Problem: Moving through a triangle of number (every number chosen yields 2 more numbers to c...

The Problem: If you were to write out a number as a word, you could then count the letters and g...

The Problem: What is the sum of the digits of 2^1000? Considerations: With python we can trivi...

The Problem: How many paths can you take if you just walk through a grid by only moving down and...

The Problem: We are trying to find the longest Collatz sequence under 1000000. Considerations: ...

The Problem: There is 100 50-digit numbers that needed to be summed together. The attached file ...

The Problem: What is the value of the first triangle number to have over five hundred divisors? ...

The Problem: Find the greatest product of 4 adjacent numbers in the grid (which can be found on ...

The Problem: We are finding primes again, this time all the primes up to 2000000! We are going ...

The Problem: A pythagorean triple is such that integers a, b, c can be a^2 + b^2 = c^2. There e...

The Problem: Prime numbers are numbers that are only divisible by themselves and 1. Let's genera...

The Problem: The sum of squares n is defined by the sum of natural numbers ascending, such that,...

The Problem: 2520 is the smallest number evenly divisible by the numbers 1 through 10.  What is ...

The Problem: 9009 is a palindromic number since it can be read forwards and backwards the same. ...