Prove that if p [tex]\geq[/tex] 5 is prime, then p[tex]^{2}[/tex] +2 is composite(adsbygoogle = window.adsbygoogle || []).push({});

(hint: work mod 3 and use #5 to show p^2 + 2 has a factor of 3.)

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Proof of composites

**Physics Forums | Science Articles, Homework Help, Discussion**