123

Number
$123$ (one hundred and twenty-three) is:


 * $3 \times 41$


 * The index (after $2$, $3$, $6$, $30$, $75$, $81$, $115$) of the $8$th Woodall prime:
 * $123 \times 2^{123} - 1$


 * The $10$th Lucas number after $(2)$, $1$, $3$, $4$, $7$, $11$, $18$, $29$, $47$, $76$:
 * $123 = 47 + 76$


 * The $24$th positive integer $n$ such that no factorial of an integer can end with $n$ zeroes.