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.
[500, 242, -124, 826, 487, -637, 938, 921, 377, -140, -12, 467, -870, 839, -317, 217]