193

Number
$193$ (one hundred and ninety-three) is:


 * The $44$th prime number


 * The $2$nd of the $14$th pair of twin primes, with $191$


 * The $37$th lucky number:
 * $1, 3, 7, 9, 13, 15, 21, \ldots, 133, 135, 141, 151, 159, 163, 169, 171, 189, 193, \ldots$


 * The $32$nd happy number after $1$, $7$, $10$, $13$, $19$, $23$, $\ldots$, $130$, $133$, $139$, $167$, $176$, $188$, $190$, $192$:
 * $193 \to 1^2 + 9^2 + 3^2 = 1 + 81 + 9 = 91 \to 9^2 + 1^2 = 81 + 1 = 82 \to 8^2 + 2^2 = 64 + 4 = 68 \to 6^2 + 8^2 = 36 + 64 = 100 \to 1^2 + 0^2 + 0^2 = 1$