seen from China
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seen from United States
seen from United States
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!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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