primes sequence

p_n

sequence of positive integers having exactly two positive divisors

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, ...

a_n = Prime[n]

Prime[Range[n]]