Is the number 39 prime or composite and is the number 29 prime or composite or is the number 51 prime or composite.

39=3×13 so composite
29 is prime
51=3×17 so composite

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?