1285

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Number

$1285$ (one thousand, two hundred and eighty-five) is:

$5 \times 257$

The number of distinct free $9$-ominoes

Also see

• 1285 9-ominoes

• Previous  ... Next: Number of Free Polyominoes

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $35$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $35$