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Is every 22n + 1 composite for 4" src="http://upload.wikimedia.org/math/b/7/0/b70b060ae1286bf01580a05e5b650c9a.png">?

Apr 21st, 2015

No 2^2^n+1 is not composite of 4

because it is not divisible by 4


Apr 21st, 2015

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