[math-fun] Orphan numbers

Hello Math-Fun, Let's call K the kid of integer J. K is the concatenation of the successive absolute differences of J's digits: For J = 2019, we have K = 218. Note that 22019 has the same "218" kid because we don't accept the possible leading 0s of K. Orphan numbers are integers with no father, like 919 or 68955. Is a list of such orphan numbers already in the OEIS? Not sure... Best, É.