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Printjmc
number theory senior
Problem
In a parlor game, the magician asks one of the participants to think of a three digit number where , , and represent digits in base in the order indicated. The magician then asks this person to form the numbers , , , , and , to add these five numbers, and to reveal their sum, . If told the value of , the magician can identify the original number, . Play the role of the magician and determine if .
Solution
Let be the number . Observe that so This reduces to one of . But also so . Of the four options, only satisfies this inequality.
Final answer
358