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Zoo of Numbers: Numbers 7 to 12  
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Archimedes Lab Books to delight your eyes & your mind!
Impossible Folding Puzzle and Other Mathematical Paradoxes
Impossible Folding Puzzles
ISBN 0486493512
3D illusions Pack: All You Need to Build 50 Great Illusions
3D Illusions Pack
ASIN 1781770972
Hidden Picture Puzzles
Hidden Picture Puzzles
ISBN 1623540380
How To Draw Incredible Illusions
How To Draw Incredible Illusions
ISBN 1623540607
Eye Bogglers
Eye Bogglers
ISBN 1780970749
Super Optical Illusions
Super Optical Illusions
ISBN 1783120851
And Yet It Moves ! (eBook)
And Yet It Moves! (eBook)
Optical Illusions: An Eye-Popping Extravaganza of Visual Tricks
Optical Illusions
ISBN 0486493547
ISBN 1847322298
L'Etrange univers des illusions d'optique
L’Etrange univers des illusions d’optique
ISBN 2215110120
Le Cabinet des illusions d'optique
Le Cabinet des illusions d’optique
ISBN 2215147407
Pliages, découpages et magie
Pliages, découpages et magie
ISBN 2848841656
ISBN 8861530923


Number 7
Live with your lucky number 7

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What's Special About This Number?

Fun facts on numbers (and their peculiar properties), both mathematical and cultural, tantalising problems and anecdotes. The number facts in this website are also available as features for print and electronic publishing.

A free 197-page eBook containing a huge collection of number facts is available for you to download.

If you got a distinctive fact about any number listed here you think Archimedes' Lab community might enjoy, why not post it here? italiano Conoscete un numero con delle proprietà originali? Contattateci!
francais Connaissez-vous un nombre avec des propriétés étonnantes? Contactez-nous!

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Encyclopedia of Numbers © G. Sarcone, Archimedes Lab, Genoa, Italy

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