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(another Prime Pages' Curiosity)
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130 is the only number equal to the sum of the squares of its first 4 divisors: 130 = 1^2 + 2^2 + 5^2 + 10^2. [Ingala]

 

  Submitted: 2004-08-25 19:40:26;   Last Modified: 2008-01-30 11:28:00.



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