99 + 9 = 108
101117
198.
105
995
The 3 largest 2 digit prime numbers are 83, 89, and 97. The sum is 269
300
101117
gentleman
52
27, whose cube is 19683
100000 + 999999 = 1099999
The smallest 5 digit integer is -99999. The largest 5 digit integer is 99999. The sum is therefore 0.