GIVEN: 2, 5, 10, 17, 26,. The numbers are increasing by odd value. 1st term = 2 2nd term = 5 3rd term = 10 4th term = 17 5th term = 26 6th term = 37 7th term = 50 Always add 2 to the difference between the two preceding numbers and add this to the later number to get the next term.