It is not a natural number but it is an integer and a real number.
22 is an integer, not a fraction!
The infinite set of numbers of the form 22*k where k is an integer.
They are members of an infinite set of numbers of the form 22*k where k is an integer.
The first integer must equal 77 - 69 = 8 , since doubling it increases the sum by this amount. Similarly, the second integer must = 91 - 69 = 22. Then the third integer is 69 - 22 - 8 = 39.