Starting with the numeral 7, triple it. Double the answer. Triple that answer. Double that answer . . . . .
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The multiples of 9, 14 and 21 are infinite, starting with: 126, 252, 378, 504, 630, 756, 882 +126 . . .
The Greatest Common Factor is 21
The least common multiple of the numbers 7, 18 and 21 is 126.
1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252