ALGORITHM TO FIND SUM OF THE SERIES 2+5+8+11...UPTO N TERMS

STEP 1.      I <-- 0, J=2, Sum <-- 0, N <-- 0

STEP 2.      Read N

STEP 3.      While (I <= N-1)

        Begin

             Sum <-- Sum+ J

         J <-- J + 3

      I <-- I + 1

             End

STEP 4.      Print Sum