Write 243 in exponential notation

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In other words, what number, when repeatedly multiplied by itself a certain number of times, yields the result 243? Keep in mind that 243 is an odd number so that's a hint. Look for some things that it's divisible by ; maybe try a factor tree.

243 = 3 times 81 = 3 times 9 times 9

= 3 times 3 times 3 times 3 times 3

= 3^5