547

Number
$547$ (five hundred and forty-seven) is:


 * The $101$st prime number


 * The smaller of the $8$th pair of primes whose prime gap is $10$:
 * $557 - 547 = 10$


 * The $14$th centered hexagonal number after $1$, $7$, $19$, $37$, $61$, $91$, $127$, $169$, $217$, $271$, $331$, $397$, $469$:
 * $547 = \ds 1 + \sum_{k \mathop = 1}^{14 - 1} 6 k = 14^3 - 13^3$


 * The $35$th left-truncatable prime after $2$, $3$, $5$, $7$, $\ldots$, $197$, $223$, $283$, $313$, $317$, $337$, $347$, $353$, $367$, $373$, $383$, $397$, $443$, $467$, $523$