To determine the original set of data, it seems like the provided numbers could be coded or represent a transformation of a simpler set of values. However, it's not immediately clear what the encoding or transformation might be based on the values alone.

Let me break it down:

• The numbers given are: 1017, 214479, 335557 8, and 401.

One possibility is that these numbers might represent a transformation, such as a sum, multiplication, or encoding from another set of numbers. Without more context on how these numbers are related to the original set, it's difficult to pinpoint the exact method used to derive them.

Could you clarify if there's any rule or pattern that these numbers follow? For instance, if there's a known mathematical operation, sequence, or pattern between them that we could apply to reverse-engineer the original data?

Alternatively, if the data follows a common form like sums of digits, factorials, or anything similar, please let me know, and I can adjust the approach accordingly.

Would you like to provide more context or examples to help narrow down the method?