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The sum of the first five prime numbers is 28. The sum of the cubes of the first three prime numbers is 160. The average of 28 and 160 is 94.
1, 8, 27, 64, 125
No, it isn't. In fact, it is not known whether are odd perfect numbers exist. The first perfect numbers are 6, 28, 496, and 8128.
The sum of the first 200 natural numbers is 20,001.
The sum of the first 10 natural numbers is 51, with an average of 5.1