SKU: 14501104038

Perfect and Amicable Numbers

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Description

Perfect and Amicable NumbersThis book contains a detailed presentation on the theory of two classes of special numbers, perfect numbers, and amicable numbers, as well as some of their generalizations. It also gives a large list of their properties, facts and theorems with full proofs. Perfect and amicable numbers, as well as most classes of special numbers, have many interesting properties, including numerous modern and classical applications as well as a long history connected

This book contains a detailed presentation on the theory of two classes of special numbers, perfect numbers, and amicable numbers, as well as some of their generalizations. It also gives a large list of their properties, facts and theorems with full proofs. Perfect and amicable numbers, as well as most classes of special numbers, have many interesting properties, including numerous modern and classical applications as well as a long history connected with the names of famous mathematicians.

 

The theory of perfect and amicable numbers is a part of pure Arithmetic, and in particular a part of Divisibility Theory and the Theory of Arithmetical Functions. Thus, for a perfect number n it holds σ(n) = 2n, where σ is the sum-of-divisors function, while for a pair of amicable numbers (n, m) it holds σ(n) = σ(m) = n + m. This is also an important part of the history of prime numbers, since the main formulas that generate perfect numbers and amicable pairs are dependent on the good choice of one or several primes of special form.

 

Nowadays, the theory of perfect and amicable numbers contains many interesting mathematical facts and theorems, alongside many important computer algorithms needed for searching for new large elements of these two famous classes of special numbers.

 

This book contains a list of open problems and numerous questions related to generalizations of the classical case, which provides a broad perspective on the theory of these two classes of special numbers. Perfect and Amicable Numbers can be useful and interesting to both professional and general audiences.

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SKU: 14501104038

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Leo
Cuba, US
★★★★★ 5
Freaking works great !
Met and exceeded my expectations! It's very durable , it has become my dogs favorite ball, it is easily seen in the snow, and at night!!
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Reviewed in the United States on January 6, 2026
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P. Williams
Battle Creek, US
★★★★★ 5
A bit pricey, but then again, our new inflated economy
Nite Ize makes great products. I especially like the extended time the ball stays lit. Especially for those times the dog decides not to retrieve and you're searching the ground for the ball in the dark. It's heavy. Good for power chewers. Not a lot of bounce but then again the light function is the primary goal.
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Reviewed in the United States on December 31, 2025
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b erm
Port Orchard, US
★★★★★ 1
Stopped working the 2nd day
I realize I am the minority. This ball has great reviews. So it has to just be my bad luck. But it worked great the 1st day. Had some problems with getting it to turn on the next day. After that it never came on again. I bought new batteries and put 2 new batteries in it. It still did not light up. Other than that, it’s great and seems durable. I just can’t get the lights to work on it.
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Reviewed in the United States on March 11, 2026
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Amazon Customer
Pawtucket, US
★★★★★ 5
Very durable and my dog loves it.
This is a great ball for the dog. It is very durable and has led light inside. Easy for me to throw and great for playing with my dog. No noise just the lights. What a great value. Even the smaller dogs can play with this one. Smaller and lighter .
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Reviewed in the United States on January 3, 2026
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Mark Phelan
Houston, US
★★★★★ 4
Nighttime is play time.
Bright and bouncy. My dogs enjoy its unpredictable movements.
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Reviewed in the United States on November 2, 2025

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