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1990 Baltic Way
15
None of these numbers are cubes
None of these numbers are cubes
Source:
April 19, 2013
geometry
3D geometry
modular arithmetic
algebra
factorization
difference of cubes
special factorizations
Problem Statement
Prove that none of the numbers
2
2
n
+
1
2^{2^n}+ 1
2
2
n
+
1
,
n
=
0
,
1
,
2
,
…
n = 0, 1, 2, \dots
n
=
0
,
1
,
2
,
…
is a perfect cube.
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