Letter Equation Solver

Letter equations have been the source of many a set of puzzles since they were invented in the 70s.

An example is:
7 = D in a W (7 days in a week)

Enter a number to see a list of possible solutions. For example enter 7 to solve 7 = D in a W or 7 = W of the W

Enter number:

  let me know if you know any more I've missed