Question 460209
Twenty-three {{{is}}} the {{{ninth}}} prime number, the {{{smallest}}} {{{odd}}} {{{prime}}} that is {{{not}}} a {{{twin}}}{{{ prime}}} (a twin prime is a prime number that differs from another prime number by two, like 11 and 13). 

Twenty-three is also the {{{fifth}}}{{{ factorial}}}{{{ prime}}}, the {{{third}}} {{{Woodall}}} prime (In number theory, a Woodall number (Wn) is any natural number of the form  {{{Wn = n * 2^n -1}}}) . 

It is an {{{Eisenstein}}}{{{ prime}}} (an Eisenstein prime is an Eisenstein

 integer  that is irreducible)  with {{{no}}}{{{ imaginary}}} part 

and real part of the form {{{3n - 1}}}.