Are Sinus Infections Catchy Perfect and friendly

I am of letters. All abstract things that have to do with numbers, volumes or the situation of things in space, to give everyday examples, we must explain them a few times. Not that understanding then the second or third, is that I can not never fully understand, and friend well versed in these arcane arts tired of trying. But my fascination with these subjects ethereal is constant, and when I find a simple explanation for what I do not understand, I agree willingly to stay in the state of stunned contemplation of the approach.
In short, I like math but do not understand. My friend F.nm once said "is there, it exists and is perfect asiVisor own is greater than the number.
* A number is

deficit when the sum of its divisors is less than the number. * A number is slightly deficient

if the sum of its divisors equals the number - 1. There are enough numbers to satisfy this condition, it did not find any number

slightly abundant (when its divisors add up the number +1). No one has succeeded in demonstrating that there are abundant numbers slightly.


* Finally, two numbers are
friendly
when each is the sum of the divisors of the other. For example,

220 and 284

. This pair of numbers mentioned in the Bi