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


 * The $6$th prime number of the form $n^2 + 1$ after $2, 5, 17, 37, 101$:
 * $197 = 14^2 + 1$