Question

The " lumper " of a number is equal to the sum of all the prime numbers less than that number. If the lumper of x is equal to the lumper of x + 3, which of the following is a possible value of x ?

a. 7
b. 8
c. 9
d. 10
e. 11

please answer and explain

Answer 1

the primes are

2 3 5 7 11 ...

The first time there is a gap of at least 3 is at n=7, so (A)

Answer 2

oops. less than, not less or equal, so (B)

2,3,5,7 are less than 8, and also less than 11.