3 5 7 11 13 17 19.
220
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Just 211.
Two numbers are relatively prime if their greatest common divisor (GCD) is 1. The GCD of 220 and 273 is 1, meaning they have no common factors other than 1. Therefore, 220 and 273 are relatively prime.
For this kind of question, I would suggest looking up a table of prime numbers. As an alternative, you can try to find factors for each of the numbers - if it has a factor, it is NOT a prime. For this range of numbers, testing for prime numbers up to 13 is appropriate. (If 17 is a factor of one of these numbers, the other factor is less than 17, so you would already have found it before you reach 17.)
211 is the only prime number between 200 and 220
There are 48 prime numbers less than 220.
220
No.
The four consecutive prime numbers that add up to 220 are: 47+53+59+61 = 220
28
220 = 2 × 2 × 5 × 11
No, they are not relatively prime.
220 is a composite number, as are all whole numbers ending in zero.
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Just 211.
Only 43 and 107 are prime numbers