Primitive Semiperfect Number/Examples/28

Example of Primitive Semiperfect Number

$28$ is a primitive semiperfect number:

$1 + 2 + 4 + 7 + 14 = 28$

Proof

We have that $28$ is a perfect number:

$28 = 1 + 2 + 4 + 7 + 14$

The result follows from Perfect Number is Primitive Semiperfect.

$\blacksquare$