# Is there a name for this sort of number?

A perfect number is a number that is the amount of its correct divisors: $$28 = 1 + 2 + 4 + 7 + 14$$

Is there a name for numbers whose only correct divisors are $1$, $2$, and also $N/2$? As an example

$6$ is divisible by $1$, $2$, and also $3$

$8$ is divisible by $1$, $2$, and also $4$

$34$ is divisible by $1$, $2$, and also $17$

Is there a name for these numbers?

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Wayne Werner 2019-05-18 23:53:14

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