Answer
Multiples of 1010 are:
1010, 2020, 3030, 4040, 5050, 6060, 7070, 8080, 9090, 10100, 11110, 12120, 13130, 14140, 15150, 16160, 17170, 18180, 19190, 20200, 21210, 22220, 23230, 24240, 25250, 26260, 27270, 28280, 29290, 30300, 31310, 32320, 33330, 34340, 35350, 36360, 37370, 38380, 39390, 40400, 41410, 42420, 43430, 44440, 45450, 46460, 47470, 48480, 49490
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