What are the explicit equation and domain for an arithmetic sequence with a first term of 5 and a second term of 3?

a_n = 5 3(n 1); all integers where n 1 a_n = 5 3(n 1); all integers where n 0 a_n = 5 2(n 1); all integers where n 0 a_n = 5 2(n 1); all integers where n 1