In this task you will be given a list of integers. You should only return an integer if the first digit is the same as the last digit in the number. If an integer has a single digit, then it should be returned. If there are no integers that start and end with the same digit then an empty list ("[]") should be returned.
[-671, -509, 723, 51, 671, -779, 402, 313, 559, -416, -368, 257, -846, 794, 427, 39, -865, 471, 550, -55, -40, -172]