1+16
2+15
3+14
4+13
5+12
6+11
7+10
8+9
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No two of those numbers add up to 17.
The two square numbers that add up to 225 are 144+81 = 225
The two prime numbers that add up to 19 are 7 and 12. Prime numbers are numbers greater than 1 that can only be divided by 1 and themselves. In this case, 7 and 12 are not prime numbers, and there are no two prime numbers that add up to 19.
2 numbers that add up to 8
62.5 and 37.5