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174
Find all prime number
p
such that both
(
4
p
2
+
1
)
and
(
6
p
2
+
1
)
are prime numbers.
2764
There are
100
guests attending a party. If everyone knows at least
67
other guests, show that there must exist
4
guests who know each other.
MODBasic
PigeonholePrinciple
ColoringMethod
With Solutions
1