Find the remainder of 6^1000 when divided by 5.
Question
Find the remainder of 6^1000 when divided by 5.
Solution
Para encontrar el residuo de al dividirlo por 5, podemos usar el pequeño teorema de Fermat. Este teorema dice que si es un número primo y es un entero que no es divisible por , entonces .
En este caso, y . Primero, notamos que 6 es congruente con 1 módulo 5, es decir:
Por lo tanto, podemos reescribir como:
Dado que cualquier número elevado a cualquier potencia sigue siendo el mismo número, tenemos:
Por lo tanto:
El residuo de al dividirlo por 5 es 1.
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