14
14
17
20 + 3 = 23 23 + 5 = 28 28 / 2 = 14 14 + 3 = 17 17 + 5 = 22 22 / 2 = 11 11 + 3 = 14 14 + 5 = 19 19 / 2 = 9.5
17
14
14
14
14
28 (add on the prime number 11)
14
45
The next perfect number after 11 is 28.
The series is a sequence of three numbers, the second number is 3 greater than the first, and the third number is 5 greater than the second. (or 8 greater than the first) 20 + 3 = 23 : 23 + 5 = 28 14 + 3 = 17 : 17 + 5 = 22 11 + 3 = 14........is therefore the next number in the sequence.
Probable answer is 11 as shown below:1 + 5 = 65 + 6 = 116 + 11 = 1711 + 17 = 28
38 - 17 = 21 / 2 = 10.5 so the number in the middle is 17 + 11 = 28
17 + 11 = 28