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PEN E Problems
1
E 1
E 1
Source:
May 25, 2007
pen
composite numbers
number theory
Problem Statement
Prove that the number
51
2
3
+
67
5
3
+
72
0
3
512^{3} +675^{3}+ 720^{3}
51
2
3
+
67
5
3
+
72
0
3
is composite.
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