197

Number
$197$ (one hundred and ninety-seven) is:


 * The $45$th prime number


 * The $1$st of the $15$th pair of twin primes, with $199$


 * The $7$th Keith number after $14, 19, 28, 47, 61, 75$:
 * $1, 9, 7, 17, 33, 57, 107, 197, \ldots$