Question

How many numbers in the list 43, 4343, 434343, ..., are prime?

Please could you give an explanation too, not just an answer?

Answer 1

Only 1 number on the list which is 43

Explanation:

A prime number is a number that is greater than 1 and has only 2 factors (1 and the number itself).

Number 43 is a prime number because it only has two distinct divisors which are 1 and 43. (43 is only a multiple of 1 and 43).