1,2,3,4,5,6,7,60,70,84,105,140,210,420
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420 has four prime factors: 2,3,5,7
420 has four prime factors: 2 3 5 7.
The Prime Factors of 360 are 2, 3, 5.The Prime Factors of 420 are 2, 3, 5, 7.
The factors of 420 are 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, and 420. 420=3*5*7*2' or 420=3x5x7x2x2
420 has four prime factors. Prime factors don't usually travel in pairs.