Question

find the sum and the different of first and the last prime or composite?

Answer 1

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Approach: The sum of two prime numbers is always even which is composite as they are odd numbers except 2. There are two cases now,

When N is even then we can print any N prime numbers except 2 and their sum will always be even i.e. odd numbers when added even number of times will give an even sum.

When N is odd then we can print 2 and any other N – 1 primes to make sure that the sum is even. Since, N – 1 is even so the sum will be even for any primes except 2 then we add 2 as the Nth number to make sure that the sum remains even.

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