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Harshad n.  and  iban n.

First numbers that belong to both sets:

1, 2, 3, 4, 7, 10, 12, 20, 21, 24, 27, 40, 42, 70, 72, 100, 102, 110, 111, 112, 114, 117, 120, 140, 144, 171, 200, 201, 204, 207, 210, 220, 222, 224, 240, 243, 247, 270, 300, 312, 320, 322, 324, 342, 370, 372, 400, 402, 407, 410, 414, 420, 423, 440, 441, 444, 700, 702, 704, 711, 720, 770, 774, 777, 1000, 1002, 1010, 1011, 1012, 1014, 1017, 1020, 1040, 1044, 1071, 1100, 1101, 1104, 1107, 1110, 1120, 1122, 1140, 1141, 1143, 1170, 1200, 1204, 1212, 1220, 1224, 1242, 1270, 1272, 1274, 1300, 1302, 1304, 1310, 1314, 1320, 1323, 1341, 1344, 1400, 1404, 1410, 1417, 1422, 1440, 1701, 1704, 1710, 1720, 1740, 1744, 1770, 2000, 2001, 2004, 2007, 2010, 2020, 2022, 2023, 2024, 2040, 2043, 2070, 2100, 2112, 2120, 2124, 2142, 2170, 2172, 2200, 2202, 2210, 2212, 2214, 2220, 2223, 2240, 2241, 2244, 2300, 2304, 2310, 2312, 2322, 2340, 2400, 2401, 2403, 2412, 2421, 2424, 2440, 2470, 2700, 2704, 2710, 2712, 2771, 2772, 3000, 3012, 3020, 3024, 3042, 3070, 3072, 3077, 3100, 3102, 3104, 3110, 3114, 3120, 3123, 3141, 3144, 3172, 3200, 3204, 3210, 3220, 3222, 3240, 3300, 3303, 3312, 3320, 3321, 3324, 3340, 3402, 3411, 3420, 3472, 3474, 3700, 3720, 3744, 4000, 4002, 4010, 4014, 4020, 4023, 4040, 4041, 4044, 4070, 4100, 4102, 4104, 4110, 4112, 4122, 4140, 4172, 4200, 4203, 4212, 4221, 4224, 4240, 4302, 4311, 4320, 4342, 4374, 4400, 4401, 4404, 4410, 4420, 4424, 4440, 4470, 4740, 4770, 4774, 7000, 7002, 7011, 7020, 7040, 7070, 7072, 7074, 7077, 7101, 7104, 7110, 7120, 7140, 7170, 7200, 7210, 7212, 7272, 7300, 7320, 7322, 7344, 7372, 7440, 7470, 7700, 7704, 7707, 7710, 7714, 7722, 7740, 7744, 7770.

Some larger examples :