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MATH / Recall that an integer d is said to be a divisor of an integer a if a/d is also an integer. For how many integers a between −200 and −1 inclusive is the product of the divisors of …

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problem

Recall that an integer dd is said to be a divisor of an integer aa if a/da/d is also an integer. For how many integers aa between −200-200 and −1-1 inclusive is the product of the divisors of aa negative?
Plain-text mathematical notation (without MathML)
Recall that an integer d is said to be a divisor of an integer a if a/d is also an integer. For how many integers a between −200 and −1 inclusive is the product of the divisors of a negative?
Original LaTeX notation
Recall that an integer $d$ is said to be a divisor of an integer $a$ if $a/d$ is also an integer. For how many integers $a$ between $-200$ and $-1$ inclusive is the product of the divisors of $a$ negative?

level

Level 5

type

Number Theory

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Source and history

task_id
2d8276ed-f431-50e4-9b25-1f982d1557da
task_key
number~5ftheory--test--2d8276ed-f431-50e4-9b25-1f982d1557da
task_revision_id
1
config / split
number_theory / test

Official source

initial import