137

Number
$137$ is:
 * The $33$rd prime number


 * The $1$st of the $11$th pair of twin primes, with $139$


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


 * 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.