Perfect Number/Examples/8128
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Example of Perfect Number
$8128$ is a perfect number:
- $1 + 2 + 4 + 8 + 16 + 32 + 64 + 127 + 254 + 508 + 1016 + 2032 + 4064 = 8128$
Proof
\(\ds 8128\) | \(=\) | \(\ds 64 \times 127\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 2^{7 - 1} \paren {2^7 - 1}\) |
Thus $8128$ is in the form $2^{p - 1} \paren {2^p - 1}$.
$2^7 - 1 = 127$ is prime.
So $8128$ is perfect by the Theorem of Even Perfect Numbers.
The aliquot parts of $8128$ are enumerated at $\sigma_0$ of $8128$:
- $1, 2, 4, 8, 16, 32, 64, 127, 254, 508, 1016, 2032, 4064$
$\blacksquare$