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nialpdrome  and  upside-down n.

First numbers that belong to both sets:

5, 55, 64, 73, 82, 91, 555, 654, 753, 852, 951, 5555, 6554, 6644, 7553, 7643, 7733, 8552, 8642, 8732, 8822, 9551, 9641, 9731, 9821, 9911, 55555, 65554, 66544, 75553, 76543, 77533, 85552, 86542, 87532, 88522, 95551, 96541, 97531, 98521, 99511, 555555, 655554, 665544, 666444, 755553, 765543, 766443, 775533, 776433, 777333, 855552, 865542, 866442, 875532, 876432, 877332, 885522, 886422, 887322, 888222, 955551, 965541, 966441, 975531, 976431, 977331, 985521, 986421, 987321, 988221, 995511, 996411, 997311, 998211, 999111, 5555555, 6555554, 6655544, 6665444, 7555553, 7655543, 7665443, 7755533, 7765433, 7775333, 8555552, 8655542, 8665442, 8755532, 8765432, 8775332, 8855522, 8865422, 8875322, 8885222, 9555551, 9655541, 9665441, 9755531, 9765431, 9775331, 9855521, 9865421, 9875321, 9885221, 9955511, 9965411, 9975311, 9985211, 9995111, 55555555, 65555554, 66555544, 66655444, 66664444, 75555553, 76555543, 76655443, 76664443, 77555533, 77655433, 77664433, 77755333, 77764333, 77773333, 85555552, 86555542, 86655442, 86664442, 87555532, 87655432, 87664432, 87755332, 87764332, 87773332, 88555522, 88655422, 88664422, 88755322, 88764322, 88773322, 88855222, 88864222, 88873222, 88882222, 95555551, 96555541, 96655441, 96664441, 97555531, 97655431, 97664431, 97755331, 97764331, 97773331, 98555521, 98655421, 98664421, 98755321, 98764321, 98773321, 98855221, 98864221, 98873221, 98882221, 99555511, 99655411, 99664411, 99755311, 99764311, 99773311, 99855211, 99864211, 99873211, 99882211, 99955111, 99964111, 99973111, 99982111, 99991111, 555555555, 655555554, 665555544, 666555444, 666654444, 755555553, 765555543, 766555443, 766654443, 775555533, 776555433, 776654433, 777555333, 777654333, 777753333, 855555552, 865555542, 866555442, 866654442, 875555532, 876555432, 876654432, 877555332, 877654332, 877753332, 885555522, 886555422, 886654422, 887555322, 887654322, 887753322, 888555222, 888654222, 888753222, 888852222, 955555551, 965555541, 966555441, 966654441, 975555531, 976555431, 976654431, 977555331, 977654331, 977753331, 985555521, 986555421, 986654421, 987555321, 987654321, 987753321, 988555221, 988654221, 988753221, 988852221, 995555511, 996555411, 996654411, 997555311, 997654311, 997753311, 998555211, 998654211, 998753211, 998852211, 999555111, 999654111, 999753111, 999852111, 999951111, 5555555555, 6555555554, 6655555544, 6665555444, 6666554444, 6666644444, 7555555553, 7655555543, 7665555443, 7666554443, 7666644443, 7755555533, 7765555433, 7766554433, 7766644433, 7775555333, 7776554333, 7776644333, 7777553333, 7777643333, 7777733333, 8555555552, 8655555542, 8665555442, 8666554442, 8666644442, 8755555532, 8765555432, 8766554432.

Some larger examples :