255

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Number

$255$ (two hundred and fifty-five) is:

$3 \times 5 \times 17$

The $25$th sphenic number after $30$, $42$, $66$, $70$, $\ldots$, $182$, $186$, $190$, $195$, $222$, $230$, $231$, $246$:

$255 = 3 \times 5 \times 17$

The $7$th positive integer solution after $1$, $3$, $15$, $104$, $164$, $194$ to $\phi \left({n}\right) = \phi \left({n + 1}\right)$:

$\phi \left({255}\right) = 128 = \phi \left({256}\right)$

Also see

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