Find the last ten digits of the non-Mersenne prime: 28433 × 27830457 + 1.
Find the largest square number formed by pairs of encoded anagrams.
Find the base/exponent pair in the file has the greatest numerical value
Finding the number of blue discs for which there is 50% chance of taking two blue.
Find the kth element in a sorted list of radicals.
How many reversible numbers are there below one-billion?
Find the last digits of a tetration calculation.
Investigating the numbers which are equal to sum of their digits raised to some power.
Counting the number of “hollow” square laminae that can form one, two, three, … distinct arrangements.
Using up to one million tiles find many different “hollow” square laminae can be formed.