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 Challenge
 Integer:  The set of numbers ...,-3,-2,-1,0,1,2,3,

The Last Digit: Given a number raised to a large power, find the one's digit of the expansion.

Want to Be a Millionaire?: If a bank doubles your money, how long will it take you to become a millionaire?

Planning Cruises: Determine when three cruises with different lengths will leave on the same day.

Consecutive Sum: Given the sum of consecutive numbers, find the least of these numbers.

Minimizing Products: Find two positive integers with a given sum and which have the smallest product.

Difference of Squares: Find positive integers which can be written as sum or difference of squares.

Save the Princess: Help Princess Stunning find a particular perfect square number.

Greatest Product: Find the greatest possible product of two natural numbers who have a particular sum.

Integer Function: Find the smallest integer by substituting numbers into a fraction