If I'm reading the problem statement right, I think either the answer to test case 2 should be 867 (123^3 = 1860867.) or n=2 (123^2=15129).
James, you are correct. Problem statement and test suite have been fixed.
Remove all the words that end with "ain"
Back to basics 6 - Column Vector
Return the first and last characters of a character array
Converting numbers back from extended form
Big numbers, repeated least significant digits
Given the name from the legend, return the handle
Generate a NaN...on purpose
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