Numerus defectivus

Naturales ${\displaystyle \mathbb {N} }$ {0,1,2,3,...} sive {1,2,3,...}

• Primi ${\displaystyle \mathbb {P} }$ {2,3,5,7,11,...}
• Abundantes
• Amicabiles
• Compositi
• Defectivi
• Perfecti
• Sociabiles
  

Integri ${\displaystyle \mathbb {Z} }$ {...,-2,-1,0,+1,+2,...}

• Pares {...,-2,0,+2,...}
• Impares {...,-3,-1,+1,+3,...}
  

Rationales ${\displaystyle \mathbb {Q} }$
Reales ${\displaystyle \mathbb {R} }$

• Irrationales
  • Numerus pi ${\displaystyle \pi =3.14159265358979\ldots }$
  • Numerus Euleri ${\displaystyle e=2.718281828459045\ldots }$

Complexi ℂ

• Algebraici
• Transcendentes
• Numerus imaginarius ${\displaystyle i={\sqrt {-1}}}$
  

Quaterni ${\displaystyle \mathbb {H} }$
Octoni ${\displaystyle \mathbb {O} }$
Infinitas ${\displaystyle \infty }$

• Radix binaria(2)
• Radix octalis(8)
• Radix decimalis(10)
• Radix sedecimalis(16)