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Challenge 293 : Reasoner Returns Again

Dr Reasoner (see challenges 160, 173, 191, 206) has been investigating some more claims about prime numbers.

From her investigations she is sure that the expression 2n + n222 is never prime for any positive integer values of n, except for n = 1.

But is she correct? Justify your answer clearly!

Submit your solution

Please do send in your solution to this problem to  weeklymaths@kcl.ac.uk  You can scan or photograph your written work, or type your solutions. If this is your first weekly maths challenge solution, please include your year group and the name of the school you attend. We'll be happy to provide you with feedback on your solution.

 

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