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Archive for May, 2009

Project Euler 99

Which base/exponent pair in the file has the greatest numerical value?

Project Euler 59

Using a brute force attack, can you decrypt the cipher using XOR encryption?

Project Euler 46

What is the smallest odd composite that cannot be written as the sum of a prime and twice a square?

Project Euler 135

Determining the number of solutions of the equation x2 − y2 − z2 = n.

Project Euler 100 Solution

Finding the number of blue discs for which there is 50% chance of taking two blue.

Project Euler 51

Find the smallest prime which, by changing the same part of the number, can form eight different primes.

Project Euler 40 Solution

Compose Champernowne’s constant

Project Euler 121

Investigate the game of chance involving coloured discs.

Project Euler 24

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

Project Euler 27

Find a quadratic formula that produces the maximum number of primes for consecutive values of n.