Oh, dude, you're making me do math now? Alright, let's see... So, prime numbers less than 50 that end with the digit 1 are 11, 31, and 41. Like, it's not rocket science, but I still had to use my brain for a second there.
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There are 35 prime numbers less than 150.
There are 27 prime numbers less than 102.
There are 15 prime numbers less than 50
There are 25 prime numbers less than 100
There are no negative prime numbers.