Error in original question

oops i just realised im doing the question wrong...

It is actually:

**can x and y be determined if it is given that there are 65 values which the sum a multiple of x and a multiple of y cannot give**

I.e. Nx + My has 65 unattainable values, where N and M are variables. Also x and y both do not equal 2.

I saw it on: __Hard math questions, again? - Yahoo! Answers__

Its the last part to the last question.

chicken mcnugget theorem..

I think this requires the chicken mcnugget theorem

but i'm not sure how to use it. any ideas?

Chicken McNugget Theorem - AoPSWiki