211

Number
$211$ (two hundred and eleven) is:


 * The $47$th prime number


 * The $4$th Euclid number after $3$, $7$, $31$:
 * $211 = p_4\# + 1 = 2 \times 3 \times 5 \times 7 + 1$


 * The $5$th Euclid prime after $2$, $3$, $7$, $31$:
 * $211 = p_4\# + 1 = 2 \times 3 \times 5 \times 7 + 1$


 * The $5$th balanced prime after $5$, $53$, $157$, $173$:
 * $211 = \dfrac {199 + 223} 2$


 * The $11$th of $11$ primes of the form $2 x^2 + 11$:
 * $2 \times 10^2 + 11 = 211$


 * The $41$st lucky number:
 * $1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $163$, $169$, $171$, $189$, $193$, $195$, $201$, $205$, $211$, $\ldots$