Find indicated sum

not sure how to type the sigma sign, but here is the problem

5 on top of the sigma sign.

under the sigma sign is i=1 and on the right side of the sigma sign (i+12)

not sure how to type the sigma sign, but here is the problem

5 on top of the sigma sign.

under the sigma sign is i=1 and on the right side of the sigma sign (i+12)