Change the Code, Change the Sequence: Robbers
Pyke, Levenshtein distance of 1, A036487, A135628 - score 5
Crack of an entry by muddyfish
wX*e

Try it here!
The original code, X*e, squares the input, X, multiplies that by the input *, and halves then floors the result, e.
The trick is that 'X' is 56 in the base 96 representation of w, so wX yields 56, multiply that by the input then floor and halve and you get 28 times the input as needed.