seen from Italy
seen from United States
seen from Türkiye
seen from Türkiye
seen from Jamaica
seen from United Kingdom
seen from United Kingdom
seen from Yemen
seen from United States
seen from United States
seen from Türkiye
seen from Japan
seen from United Kingdom
seen from Poland
seen from Canada
seen from Australia
seen from Brazil
seen from United States
seen from United States
seen from Canada
!n
148.349 es el único número igual a la suma de subfactoriales de sus cifras.
Un subfactorial (!n) cuenta el número de formas diferentes en que n amigos pueden intercambiar regalos si cada uno da y recibe un regalo. Por ejemplo, en un amigo invisible con 4 personas, !4 = 9.
