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 $2, 3, 5, 13, 89$.