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1990 ITAMO
5
x^2 +5x+16 not divisible by 169
x^2 +5x+16 not divisible by 169
Source: 1990 ITAMO p5
January 31, 2020
number theory
divisible
trinomial
Problem Statement
Prove that, for any integer
x
x
x
,
x
2
+
5
x
+
16
x^2 +5x+16
x
2
+
5
x
+
16
is not divisible by
169
169
169
.
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