13, 23, 43, 53, 73 & 83
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0 Look at the product of the first 3 prime numbers: 2 x 3 x 5 = 30. Any number multiplied by 30 will have a 0 in the units digit. So, no matter how many prime numbers you are multiplying, if once you have a number ending in 0, all of the rest will end in 0.
There are 168 = 4,294,967,296 such numbers.
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.
No. If they end in 4, they are even numbers and divisible by 2, and therefore are not prime.
All numbers ending in 0 and 5 are divisible by 5 and since 28655 ends in 5, it is divisible by 5 and therefore not prime.