801.
Use the quartic: t(n) = (63n4 - 742n3 + 3009n2 - 4862n + 2676)/4 for n = 1, 2, 3, ...
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times 2, times 3, times 4, times 5 The next number will be 120
60, 120, 180, 240, 300, 360, 420, 480, 540, & 600
24 factors: 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 45 54 60 90 108 135 180 270 540.
The least common multiple (LCM) of 3, 4, and 15 is 60.The multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, and so on.The multiples of 4 are 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, and so on.The multiples of 15 are 15, 30, 45, 60, and so on.The least number you can find that goes in all the numbers is 60.60
10, 20, 30, 40, 50, 60