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Harshad n.  and  super Niven n.

First numbers that belong to both sets:

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 20, 24, 30, 36, 40, 48, 50, 60, 70, 80, 90, 100, 102, 110, 120, 140, 150, 200, 204, 210, 220, 240, 280, 300, 306, 330, 360, 400, 408, 420, 440, 480, 500, 510, 540, 550, 600, 630, 660, 700, 770, 800, 840, 880, 900, 990, 1002, 1008, 1010, 1020, 1040, 1050, 1080, 1100, 1110, 1140, 1200, 1320, 1400, 1440, 1500, 1800, 2000, 2004, 2010, 2016, 2020, 2040, 2080, 2100, 2200, 2220, 2280, 2400, 2520, 2640, 2800, 2880, 3000, 3006, 3030, 3060, 3120, 3300, 3330, 3600, 3960, 4000, 4008, 4020, 4040, 4080, 4100, 4200, 4400, 4440, 4500, 4800, 5000, 5010, 5040, 5050, 5100, 5400, 5500, 5550, 6000, 6030, 6060, 6240, 6300, 6600, 6660, 7000, 7070, 7700, 7770, 8000, 8040, 8080, 8200, 8400, 8800, 8880, 9000, 9090, 9360, 9900, 9990, 10000, 10002, 10008, 10010, 10020, 10040, 10050, 10080, 10100, 10110, 10140, 10200, 10320, 10400, 10440, 10500, 10800, 11000, 11010, 11040, 11100, 11220, 11400, 12000, 12120, 12300, 12600, 13020, 13200, 14000, 14040, 14100, 14400, 15000, 15120, 18000, 20000, 20004, 20010, 20020, 20040, 20080, 20100, 20160, 20200, 20220, 20280, 20400, 20640, 20800, 20880, 21000, 21120, 21300, 22000, 22020, 22080, 22200, 22440, 22800, 23100, 24000, 24240, 24600, 25200, 26040, 26400, 28000, 28080, 28200, 28800, 30000, 30006, 30030, 30060, 30120, 30240, 30300, 30330, 30600, 30960, 31020, 31200, 32100, 33000, 33030, 33300, 33660, 34020, 36000, 36360, 36900, 39060, 39600, 40000, 40008, 40020, 40040, 40080, 40100, 40200, 40320, 40400, 40440, 40500, 40800, 41000, 41040, 41100, 41400, 42000, 42240, 42600, 44000, 44040, 44400, 44880, 45000, 46200, 48000, 48480, 50000, 50010, 50040, 50050, 50100, 50400, 50500, 50550, 51000, 52500, 54000, 55000, 55020, 55050, 55500, 60000, 60030, 60060, 60240.

Some larger examples :