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1, 3, 7, 21.
3*7 = 21
1 x 21, 3 x 7 = 21
21 multiplies to 21 to make it 441
They are: 25 minus 4 = 21
21+11 8x4
21*6=126
21 and 5
20 and 1
1, 2 and 21 when added.
21 and 22
3 and 7