Not a question - just something I came across in a math book. Amicable Numbers:- 220 and 284 are good friends. Why? - well the divisors of 220 are 1,2,4,5,10,11,20,22,44,55 and 110 and if you add them up you get 284. You've guessed it. If you figure out the divisors of 284 and add them up you get 220. Don't expect they are of any practical use but they have been used in compiling romantic horoscopes!

Question

Not a question - just something I came across in a math book. Amicable Numbers:-  220 and 284 are good friends. Why? - well the divisors of 220 are 1,2,4,5,10,11,20,22,44,55 and 110 and if you add them up you get 284. You've guessed it. If you figure out the divisors of 284 and add them up you get 220. Don't expect they are of any practical use but they have been used in compiling romantic horoscopes!

parthkohli · Answer

23433543553565 and 393939565255325329639 are good friends too.
Why?
Because they are numbers!

parthkohli · Answer

BTW, 220 is also a divisor of 220.
Similar for 284.

cwrw238 · Answer

lol  -  
ahh it don't work when you use the numbers themselves - so the discoverers ignored that!

cwrw238 · Answer

Pythagoras is thought to have known about these numbers  so that figures - he was supposed to be a bit mad anyway!