10001 is not a Prime number (it is 73 x 137)
The "first 5-digit prime number" is 10007.
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83 is the next prime number.
the next prime number after 51 is 60 :)
ANSWER: The next prime number after 80 is 83.
The next prime number after 100,000 is 100,003
The next prime number after 3 is 5