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S.O.S. is not a prime (Posted on 2017-02-15) Difficulty: 3 of 5
Prove that:
if for integers a,b,c,d
a*d= b2+b*c+c2
then:
a2+b2+ c2 + d2
is a composite number.

No Solution Yet Submitted by Ady TZIDON    
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