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# What is the first decade with only 4 prime numbers?

Updated: 11/4/2022

Wiki User

14y ago

1-10 AD had the years 2, 3, 5, and 7, which were prime numbers.

Wiki User

14y ago

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Q: What is the first decade with only 4 prime numbers?
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### Only once in American history has there been a decade in which four of the years were prime numbers can you find it?

The 1870s. 1871, 1873, 1877, and 1879 are all prime numbers.

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2, 3, 5, and 7.Prime numbers obey the simple rule: Prime numbers can only be divided by 1 and themselves. Which means that they only have two factors.1 is also sometimes considered a prime number, but it is not. It has only one factor, so disobeys the rule.

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