229

Number
$229$ (two hundred and twenty-nine) is:


 * The $50$th prime number


 * The $2$nd of the $16$th pair of twin primes, with $227$


 * The $11$th of $29$ primes of the form $2 x^2 + 29$:
 * $2 \times 10^2 + 29 = 229$