25 205 2005 52 502 5002 520 5200 5020 2050 20500 etc
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Zero. Any five consecutive natural numbers will contain at least one multiple of 2 and at least one multiple of 5, meaning that the product will be a multiple of 10.
125,000x2 (or 125,000(2))
prime numbers only have 2 factors, themselves, and one (1). Copmposite numbers have at least 3
-2, 0, 1, 3, 3.
The first five prime numbers are 2, 3, 5, 7, 11. The sum of these five numbers is 28.