Any multiple of 276.
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Only 1 and 23.
23 and 29 are both prime numbers.
Oh, dude, let me break it down for you. So, first, you find how many numbers are divisible by 6, which is 166. Then you find how many are divisible by 21, which is 47. But wait, don't forget to subtract the ones divisible by both 6 and 21, which is 7. So, the total is 166 + 47 - 7 = 206 integers that fit the bill. Easy peasy!
1, 2, 5, 10, 23, 46, 115, 230
The Prime Numbers in the 20's are 23 and 29 because they are only divisible by 1 and the number itself.