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Omni-MATH / Find all odd natural numbers n such that d(n) is the largest divisor of the number n different from n. (d(n) is the number of divisors of the number n including 1 and n ).

Problem

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problem

Find all odd natural numbers nn such that d(n)d(n) is the largest divisor of the number nn different from nn. (d(n)d(n) is the number of divisors of the number n including 11 and nn ).
Plain-text mathematical notation (without MathML)
Find all odd natural numbers n such that d(n) is the largest divisor of the number n different from n.
(d(n) is the number of divisors of the number n including 1 and n ).
Original LaTeX notation
Find all odd natural numbers $n$ such that $d(n)$ is the largest divisor of the number $n$ different from $n$.
($d(n)$ is the number of divisors of the number n including $1$ and $n$ ).

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