One possible answer:
Un = (28n3 - 207n2 + 459n - 268)/2 for n = 1, 2, 3, ...
Following the BODMAS rule, Input: 9 ÷ 8 + 5 ÷ 6 = 9/8 + 5/6 = 47/24 = 1 23/24
19/24 plus 1/6 = 23/24
24 minus 1/6 is 23 5/6.
5/6 + 1/8 = 20/24 + 3/24 = 23/24.
1 and 23 can go into 23. 1, 2, 3, 4, 6, 8, 12, and 24 can go into 24. The only number that can go into both of them evenly is ' 1 '.
24 + 1 + 3 + 6 then repeat so 23 + 1 = 24
23 + 24 + 24 + 6 = 47 + 30 = 77
23/24
4/24=1/6
If you mean: 2 5 11 23 47 then they are increasing by 3 6 12 24
The rule for the sequence 6, 18, 24, 30 is that each number is obtained by adding 12 to the previous number. This is because 6 + 12 = 18, 18 + 6 = 24, and 24 + 6 = 30. Therefore, the pattern is increasing by 12 each time.
24 - 4/6 = 24/1 - 4/6 = 144/6 - 4/6 = 140/6 = 70/3 or 23 1/3