The first two triangle numbers are 3 and 6.
[Unless you start with 1 as the first.]
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1000 and 2
The sum of the first n cubed numbers is the square of the nth triangular number.
the numbers betwenn 1 and 365222
Because it is ! The first 10 triangular numbers are... 1,3,6,10,15,21,28,36,45 & 55
The first twelve triangular numbers are: 1 3 6 10 15 21 28 36 45 55 66 78