Examples
The sequence of Giuga numbers begins
- 30, 858, 1722, 66198, 2214408306, … (sequence A007850 in OEIS).
For example, 30 is a Giuga number since its prime factors are 2, 3 and 5, and we can verify that
- 30/2 - 1 = 14, which is divisible by 2,
- 30/3 - 1 = 9, which is 3 squared, and
- 30/5 - 1 = 5, the third prime factor itself.
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