is this possible
if A is a prime number then A + 100 is also prime is A is not a part of the following series
2,5,8,11,14,17,20,23,26............
prove it also
Counterexample: $\displaystyle 19$ is prime and is not included in the sequence $\displaystyle a_{n} = 2+3n$, but $\displaystyle 119=7\cdot 17$ is not a prime...