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happy n.  and  upside-down n.

First numbers that belong to both sets:

19, 28, 82, 91, 5555, 35557, 44566, 46546, 53575, 57535, 64564, 66544, 75553, 123789, 127389, 132879, 134679, 135579, 136479, 138279, 143769, 147369, 153759, 157359, 163749, 167349, 172839, 174639, 175539, 176439, 178239, 183729, 187329, 213798, 217398, 224688, 226488, 231978, 235578, 239178, 242868, 248268, 253758, 257358, 262848, 268248, 271938, 275538, 279138, 284628, 286428, 293718, 297318, 312897, 314697, 315597, 316497, 318297, 321987, 325587, 329187, 341967, 349167, 351957, 352857, 358257, 359157, 361947, 369147, 381927, 385527, 389127, 392817, 394617, 395517, 396417, 398217, 413796, 417396, 422886, 428286, 431976, 439176, 471936, 479136, 482826, 488226, 493716, 497316, 513795, 517395, 523785, 527385, 531975, 532875, 538275, 539175, 571935, 572835, 578235, 579135, 583725, 587325, 593715, 597315, 613794, 617394, 622884, 628284, 631974, 639174, 671934, 679134, 682824, 688224, 693714, 697314, 712893, 714693, 715593, 716493, 718293, 721983, 725583, 729183, 741963, 749163, 751953, 752853, 758253, 759153, 761943, 769143, 781923, 785523, 789123, 792813, 794613, 795513, 796413, 798213, 813792, 817392, 824682, 826482, 831972, 835572, 839172, 842862, 848262, 853752, 857352, 862842, 868242, 871932, 875532, 879132, 884622, 886422, 893712, 897312, 923781, 927381, 932871, 934671, 935571, 936471, 938271, 943761, 947361, 953751, 957351, 963741, 967341, 972831, 974631, 975531, 976431, 978231, 983721, 987321, 1155599, 1515959, 1595159, 1955519, 2235788, 2275388, 2325878, 2345678, 2365478, 2385278, 2435768, 2475368, 2555558, 2635748, 2675348, 2725838, 2745638, 2765438, 2785238, 2835728, 2875328, 3225887, 3245687, 3265487, 3285287, 3345677, 3365477, 3425867, 3435767, 3475367, 3485267, 3625847, 3635747, 3675347, 3685247, 3745637, 3765437, 3825827, 3845627, 3865427, 3885227, 4235786, 4275386, 4325876, 4335776, 4375376, 4385276, 4725836, 4735736, 4775336, 4785236, 4835726, 4875326, 5115995, 5195195, 5255585, 5525855, 5585255, 5855525, 5915915, 5995115, 6235784, 6275384, 6325874, 6335774, 6375374, 6385274, 6725834, 6735734, 6775334, 6785234, 6835724, 6875324, 7225883, 7245683, 7265483, 7285283, 7345673, 7365473, 7425863, 7435763, 7475363, 7485263, 7625843, 7635743, 7675343, 7685243, 7745633, 7765433, 7825823, 7845623, 7865423, 7885223, 8235782, 8275382, 8325872, 8345672, 8365472, 8385272, 8435762, 8475362, 8555552, 8635742, 8675342, 8725832, 8745632, 8765432, 8785232, 8835722, 8875322, 9155591, 9515951, 9595151, 9955511.