831

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Number

$831$ (eight hundred and thirty-one) is:

$3 \times 277$

The upper 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): $818$