233

Number
$233$ (two hundred and thirty-three) is:


 * The $51$st prime number


 * The $16$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $53$, $83$, $89$, $113$, $131$, $173$, $179$, $191$:
 * $2 \times 233 + 1 = 467$, which is prime.


 * The $13$th Fibonacci number, after $1$, $1$, $2$, $3$, $5$, $8$, $13$, $21$, $34$, $55$, $89$, $144$:
 * $233 = 89 + 144$


 * The $6$th Fibonacci prime after $2$, $3$, $5$, $13$, $89$


 * The $2$nd element of the smallest triple of consecutive positive integers each of which is the sum of two squares:
 * $232 = 14^2 + 6^2$, $233 = 13^2 + 8^2$, $234 = 15^2 + 3^2$