100 Day Summer Challenge

100 problems in 100 days. #100problems

Day 25

25 of 100: Life, the Universe, and Everything

The positive number X\color{#D61F06}X is divisible by 42, and is composed of only 1s and 0s when written in base 10. What's the smallest number that X\color{#D61F06}X might be?

If you don't know where to begin, take a peek at the divisibility rules on this page.


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