1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 18, 21, 24, 28, 36, 42, 56, 63, 72, 84, 126, 168, 252, 504, -1, -2, -3, -4, -6, -7, -8, -9, -12, -14, -18, -21, -24, -28, -36, -42, -56, -63, -72, -84, -126, -168, -252, -504
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Greatest common factor of 420 and 504 is 84.
The Highest Common Factor is 126
The greatest common factor of 540 and 1430 is 10.
The LCM is: 504
(504,1)(252,2)(168,3)(126,4)(84,6)(72,7)(63,8)(56,9)(42,12)(36,14)(28,18)(24,21)