One of the following numbers is not divisible by any prime number less than 10 . Which is it?

**Answer Choices**

A. 2^{606}-1

B. 2^{606}+1

C. 2^{607}-1

D. 2^{607}+1

E. 2^{607}+3^{607}

One of the following numbers is not divisible by any prime number less than 10 . Which is it?

**Answer Choices**

A. 2^{606}-1

B. 2^{606}+1

C. 2^{607}-1

D. 2^{607}+1

E. 2^{607}+3^{607}