137

Number
$137$ (one hundred and thirty-seven) is:


 * The $33$rd prime number


 * The $4$th Stern number after $1$, $3$, $17$


 * The $4$th Stern prime after $1$, $3$, $17$


 * The smaller of the $11$th pair of twin primes, with $139$


 * The $17$th left-truncatable prime after $2$, $3$, $5$, $7$, $13$, $17$, $23$, $37$, $43$, $47$, $53$, $67$, $73$, $83$, $97$, $113$


 * The $57$th positive integer after $2$, $3$, $4$, $7$, $8$, $\ldots$, $95$, $96$, $100$, $101$, $102$, $107$, $112$, $116$, $124$, $136$ which cannot be expressed as the sum of distinct pentagonal numbers.