5. The sum of four consecutive primes is itself prime.
What is the largest of the four primes?
A 37
B 29
C 19
D 13
E 7
SOlUtion $\square$
The sum of four odd primes is an even number greater than 2 , and therefore is not a prime. Therefore the four consecutive primes whose sum is prime includes the only even prime 2 .

It follows that the four consecutive primes are $2,3,5$ and 7 . Their sum is 17 which is a prime. The largest of these four consecutive primes is 7 .