727

Number
$727$ (seven hundred and twenty-seven) is:


 * The $129$th prime number.


 * The larger of the $10$th pair of primes whose prime gap is $8$:
 * $727 - 719 = 8$


 * The $15$th palindromic prime:
 * $2$, $3$, $5$, $7$, $11$, $101$, $131$, $151$, $181$, $191$, $313$, $353$, $373$, $383$, $727$, $\ldots$


 * The $3$rd integer after $428$, $573$ whose square has a decimal representation consisting of the concatenation of $2$ consecutive increasing integers:
 * $727^2 = 528 \, 529$