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by Robert Brook/science Photo Library
$41.95
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Weird Numbers iPhone case by Robert Brook/science Photo Library. Protect your iPhone with an impact-resistant, slim-profile, hard-shell case. The image is printed directly onto the case and wrapped around the edges for a beautiful presentation. Simply snap the case onto your iPhone for instant protection and direct access to all of the phone's features!
Design Details
The first 17 weird numbers. A weird number is an abundant number that is not semi-perfect. Abundant numbers are ones where the sum of proper divisors... more
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3 - 4 business days
Protect your with an impact-resistant, slim-profile, hard-shell case. The image is printed directly onto the case and wrapped around the edges for a beautiful presentation. Simply snap the case onto your for instant protection and direct access to all of the phone's features!
The first 17 weird numbers. A weird number is an abundant number that is not semi-perfect. Abundant numbers are ones where the sum of proper divisors total that or a greater number. A semi-perfect number is one whose divisors, or a subset of, total that number exactly. For example the divisors of 12 (the smallest abundant number) are 1, 2, 3, 4 and 6, and total 16. The subset 2, 4, 6 total 12. Hence it is also semi-perfect. Only a tiny proportion of abundant numbers are not semi-perfect. Illustration.
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$41.95
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