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Omni-MATH / Isabella writes the expression √(d) for each positive integer d not exceeding 8 ! on the board. Seeing that these expressions might not be worth points on HMMT, Vidur simplifies ea…

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problem

Isabella writes the expression d\sqrt{d} for each positive integer dd not exceeding 8 ! on the board. Seeing that these expressions might not be worth points on HMMT, Vidur simplifies each expression to the form aba \sqrt{b}, where aa and bb are integers such that bb is not divisible by the square of a prime number. (For example, 20,16\sqrt{20}, \sqrt{16}, and 6\sqrt{6} simplify to 25,412 \sqrt{5}, 4 \sqrt{1}, and 161 \sqrt{6}, respectively.) Compute the sum of a+ba+b across all expressions that Vidur writes.
Plain-text mathematical notation (without MathML)
Isabella writes the expression √(d) for each positive integer d not exceeding 8 ! on the board. Seeing that these expressions might not be worth points on HMMT, Vidur simplifies each expression to the form a√(b), where a and b are integers such that b is not divisible by the square of a prime number. (For example, √(20),√(16), and √(6) simplify to 2√(5),4√(1), and 1√(6), respectively.) Compute the sum of a+b across all expressions that Vidur writes.
Original LaTeX notation
Isabella writes the expression $\sqrt{d}$ for each positive integer $d$ not exceeding 8 ! on the board. Seeing that these expressions might not be worth points on HMMT, Vidur simplifies each expression to the form $a \sqrt{b}$, where $a$ and $b$ are integers such that $b$ is not divisible by the square of a prime number. (For example, $\sqrt{20}, \sqrt{16}$, and $\sqrt{6}$ simplify to $2 \sqrt{5}, 4 \sqrt{1}$, and $1 \sqrt{6}$, respectively.) Compute the sum of $a+b$ across all expressions that Vidur writes.

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