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Cynthia Mcclain
31 December, 10:21
What is friendly numbers
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Piglet
31 December, 11:04
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Hello,
6 and 28 are friendly numbers.
1) calculate the divisors of each numbers:
div 6={1,2,3,6} sum=1+2+3+6=12 divide by the number: 12/6=2.
div 28={1,2,4,7,14,28} sum=1+2+4+7+28=56 = = >56/28=2
Ratio fo the sum of divisors by the number are the same: these are friendly numbers.
ex: (6,28), (30,140), (80,20), (40,224), (12,234), (84,270) ...
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