17/Historical Note

Historical Note on $17$
$17$ was the highest number whose square root was proved irrational by.

Plutarch reports that the Pythagoreans had a horror of the number $17$.

That was because it lay half way between $16$ and $18$, which are the areas of rectangles whose areas equal their perimeters.

$17$ seems to be a popular age to write a pop song about:
 * At Seventeen by Janis Ian
 * 7-Teen by The Regents
 * Edge of Seventeen by Stevie Nicks

to name but three.