123

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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.

Also see

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