[PaulHoule]

n-grams will be able to figure out

   4 + 5 = 9

or

   1729 is a taxicab number

if those phrases are in the database but not

   4 + 05 = 9

   5 + 4 = 9

   11 + 3 = 14

   48988659276962496 is a taxicab number

if those are not in the database.