For which nnn is n2+n+1n^2 + n + 1n2+n+1 divisible by 333?
Never
n≡2(mod3)n \equiv 2 \pmod{3}n≡2(mod3)
n≡1(mod3)n \equiv 1 \pmod{3}n≡1(mod3)
n≡0(mod3)n \equiv 0 \pmod{3}n≡0(mod3)