What is 3n+1 50th term?

1, 4, 7, 10 is a sequence starting with 1. You get the next term by adding 3 to the previous term. You are often asked to find a formula for the nth term. As the common difference is 3, try 3n. When n = 1, 3n = 3, and we subtract 2 to make the first term correct.

It refers to the term that is to be found, which happens to be the 3n+150th term in your case, find n, plug it in, and answer for that specific number of term.