seen from Singapore
seen from France
seen from Canada
seen from Malaysia
seen from United States
seen from China
seen from Morocco
seen from China
seen from Chile
seen from T1
seen from Malaysia
seen from United States
seen from Canada
seen from United States
seen from United States
seen from France
seen from United States
seen from United States
seen from China
seen from Austria
!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.
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