One set is: 2+7+11 = 20
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All prime numbers greater than 2 are odd numbers. For an odd prime to be written as the sum of two primes, one of the primes must be 2 because two odd primes will produce an even sum. 11 cannot be written as the sum of two primes. 13 = 2 + 11. 17 cannot be written as the sum of two primes. 19 = 2 + 17.
2 + 3 = 5
23+29+31+37+41+47+53+59 = 320
Oh, what a delightful question! Let's take a moment to appreciate the beauty of prime numbers. The prime numbers between 10 and 20 are 11, 13, 17, and 19. When we add them together with a gentle brushstroke of mathematics, we get a sum of 60. Happy little primes indeed!
All of these could yield an integer when divided by 10. 1. sum of two integers: ( 10 + 10)/10 = 2 2. integer less than 10: -20 < 10 and -20/10 = -2 3. product of 2 primes: 2 and 5 are primes and 2*5/10 = 1 4. sum of three consecutive integers ; (9+10 + 11) /10 3