82

Number
$82$ (eighty-two) is:


 * $2 \times 41$


 * The $26$th semiprime:
 * $82 = 2 \times 41$


 * The $15$th happy number after $1$, $7$, $10$, $13$, $19$, $23$, $28$, $31$, $32$, $44$, $49$, $68$, $70$, $79$:
 * $82 \to 8^2 + 2^2 = 64 + 4 = 68 \to 6^2 + 8^2 = 36 + 64 = 100 \to 1^2 + 0^2 + 0^2 = 1$