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a^3 - 1 faktorkan
= (a-1)(a^2 + a + 1)
a = 1 yg memenuhi
bilangan bulat yg memenuhi persamaan itu , hitung dg
24a + 1
akan ketemu angka 1, 25 , 49, 73, 97
jadi banyak bilangan bulat yg memenuhi soal diatas ada 5 bilangan