Amicable Numbers 220,284

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Ali Adams

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Aug 18, 2015, 8:25:15 PM8/18/15
to Haifeng, Hatim Zaghloul, Waleed m, maher amin, Ali Adams, United-quran, Çhadi metab
Amicable Numbers
First pair of amicable numbers is (220, 284) because:
The sum of the proper divisors of 220 = 1+2+4+5+10+11+20+22+44+55+110 = 284
The sum of the proper divisors of 284 = 1+2+4+71+142                                   = 220

Now have a look at this relationship to 114 :)

220  = C172 = AC114
284  = C222 = AC150
150  = C114 = AC73

where C# means the #th composite
and  AC# means the #th additive composite [composite and its digit sum is also composite]

Alhamdu liAllah infinitely ...

Ali


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