What are the multiples of 1400?

Answer 1

The first 100 multiples of 143 are:

143, 286, 429, 572, 715, 858, 1001, 1144, 1287, 1430, 1573, 1716, 1859, 2002, 2145, 2288, 2431, 2574, 2717, 2860, 3003, 3146, 3289, 3432, 3575, 3718, 3861, 4004, 4147, 4290, 4433, 4576, 4719, 4862, 5005, 5148, 5291, 5434, 5577, 5720, 5863, 6006, 6149, 6292, 6435, 6578, 6721, 6864, 7007, 7150, 7293, 7436, 7579, 7722, 7865, 8008, 8151, 8294, 8437, 8580, 8723, 8866, 9009, 9152, 9295, 9438, 9581, 9724, 9867, 10010, 10153, 10296, 10439, 10582, 10725, 10868, 11011, 11154, 11297, 11440, 11583, 11726, 11869, 12012, 12155, 12298, 12441, 12584, 12727, 12870, 13013, 13156, 13299, 13442, 13585, 13728, 13871, 14014, 14157, 14300

If you want any more, you can work them out yourself.

Answer 2

Infinite. Here are the first 10:

134, 268, 402, 536, 670, 804, 938, 1072, 1206, 1340 . . .

Answer 3

1400, 2800, 4200, 5600, 7000, 8400, 9800, . . .