337

Number
$337$ (three hundred and thirty-seven) is:


 * The $68$th prime number


 * The $17$th emirp after $13$, $17$, $31$, $37$, $71$, $73$, $79$, $97$, $107$, $113$, $149$, $157$, $167$, $179$, $199$, $311$


 * The $18$th permutable prime after $2$, $3$, $5$, $7$, $11$, $13$, $17$, $31$, $37$, $71$, $73$, $79$, $97$, $113$, $131$, $199$, $311$


 * The $6$th obstinate number after $1$, $127$, $149$, $251$, $331$


 * The smaller of the $5$th pair of primes whose prime gap is $10$:
 * $347 - 337 = 10$


 * The $8$th of the sequence of $n$ such that $p_n \# - 1$, where $p_n \#$ denotes primorial of $n$, is prime:
 * $3$, $5$, $11$, $13$, $41$, $89$, $317$, $337$