SOLUTION: how many 4 digit prime numbers are there?

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Question 238106: how many 4 digit prime numbers are there?
Answer by solver91311(12126) About Me  (Show Source):
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Here are two lists:

Prime numbers less than 1000: http://www.factmonster.com/math/numbers/prime.html

Prime numbers less than 10000: http://aleph0.clarku.edu/~djoyce/numbers/primes.html

The answer to your question is the number of items in the second list minus the number of items in the first list. Fortunately, both of these lists are arranged in rows and columns, so it should be fairly simple to count the number of elements in each.

Good luck.

John