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Maths time /sci/

Name: Anonymous 2008-02-26 20:22

People should post more maths.

Find a number k such that n^4 + k is composite for all integer n.

Name: Anonymous 2008-02-28 12:32

>>9,10
both incorrect.
1. x^4 is x^2 * x^2.
2. x^2 is always even.
3. let y = x^2
4. then x^2 * x^2 = y^2
5. see 3
QED

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