There are many possible answers.
One is the cubic function:
Un = (n3 - 9n2 + 44n - 6)/6 for n = 1, 2, 3, ...
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If you mean: 2 5 11 23 47 then they are increasing by 3 6 12 24
More info would be nice but if you mean what is the fraction that indicates 12 of 15 it would be 4/5 ? of 15 as 4/5 * 15 = 60/5 or 12 & 5/5 * 15 = 75/5 or 15
The pattern rule for the given sequence is that each number is the sum of the previous number and a specific increment. In this case, the increment appears to be increasing by 1, then 2, then 3, then 4, and finally 5. So, the pattern rule can be expressed as: (n = n-1 + k), where (k) is the increment.
Given that: 12/3 = 4 15/3 = 5 12/15 = 4/5