How about: 36+61 = 97
97 is prime.
The sum of prime numbers between 90 and 100 is 97, the only prime number between 90 and 100.
It is: 2+97 = 99
The sum of 2 and 97 is 99.
The largest prime is 97 and the smallest is 2 (1 is not considered part of the prime number set). So the sum is 97 + 2 = 99
In the interval [10,100] the lowest prime number is 11. The highest prime number is 97. 11 + 97 = 108.
Prime. Take a near square root of your number; round it off to the next higher value, you will get a number say X. Check whether X divdes your number finitely, if yes then that number is composite else prime.
61+97=158 The sum is 158
It is: 3 plus 97 = 100
158 is the sum of the greatest and smallest prime numbers between 60 and 97.
It is: 97+2 = 99
They are: 89+97 = 186