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Math Help - HArd problem?

  1. #1
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    HArd problem?

    A. Only once in American history has there been a decade (1790ís, 1940ís, etc.) in which four of the years (as four-digit numbers) were prime numbers. Find it.

    B. Find the first decade (A.D.) in which all of the years were composite (non-prime) numbers. (Hint: America was not around then.)

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  2. #2
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    Quote Originally Posted by anime_mania View Post
    A. Only once in American history has there been a decade (1790ís, 1940ís, etc.) in which four of the years (as four-digit numbers) were prime numbers. Find it.
    I assume you want 1777 but 1 is not prime. There is no answer.

    B. Find the first decade (A.D.) in which all of the years were composite (non-prime) numbers. (Hint: America was not around then.)
    1 A.D.
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