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The first two triangle numbers are 3 and 6. [Unless you start with 1 as the first.]
The first digit is a three.
whenever you start the factor tree always divide by the lowest number possible first... 2 * 5 * 3 * 3 * 3 = 270 2 = 2 5 = 5 9 = 3 * 3 * 3
That all depends on where you start and what direction you go. If you start at 1,247 and go down, they are 1210, 1100, and 990. If you start at 114 and go up, they are 220, 330, and 440.
you start with the number three for the first one, then u keep adding three to it so 1x3=3 2x3=6 3x3=9 ect.