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References to 'arithmetic progression'
1. Behrend's construction by bbukh
2. Chen prime by PrimeFan
3. F\"urstenberg's proof of the infinitude of primes by mathcam
4. Hausdorff space not completely Hausdorff by drini
5. sum of odd numbers by pahio
6. summation by drini
7. Szemer\'edi's theorem by bbukh