[tex]D_{2} = \left \{ \pm1,\pm2 \right \}[/tex]
[tex]D_{3} = \left \{ \pm1,\pm3\right \}[/tex]
[tex]D_{14} = \left \{ \pm1,\pm2,\pm7,\pm14\right \}[/tex]
[tex]D_{30} = \left \{ \pm1,\pm2,\pm3,\pm5,\pm6,\pm10,\pm15,\pm30\right \}[/tex]
[tex]D_{47} = \left \{ \pm1,\pm47\right \}[/tex]
