818

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Number

$818$ (eight hundred and eighteen) is:

$2 \times 409$

The lower end of the largest gap between two consecutive semiprimes less than $1000$:

$831 - 818 = 13$

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $818$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $818$