0
Formula for the nth Triangular Number:
t(n) = 1/2n(n + 1) OR t(n) = (n2 + n)/2
t(0) = 0
t(1) = 1
t(2) = 3
t(3) = 6
t(4) = 10
t(5) = 15
t(6) = 21
t(7) = 28
t(8) = 36
t(9) = 45
t(10) = 55
t(11) = 66
t(12) = 78
t(13) = 91
t(14) = 104
t(15) = 120
For a more extensive list, or for more any more information about the Triangular Numbers, type "Triangular Numbers" into Google. You'll find lots of helpful websites there.
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Continue Learning about Other Math
List all the triangular numbers up to 36?
1, 3, 6, 10, 15, 21, 28, 36
What are the triangular numbers up to a hundred?
1,3,6,10,15,21,28,36,45,47,66,78,91,95
What are all the triangular numbers up to 200?
0,1,3,6,10,15,21,28,36,45,56,68,81,95,110,126,143,161,180,200. That's all the triangular numbers up to 200! I hope that's helped anyone with any thing.
What 2 triangular numbers add up to 43?
45
What multiplies to 120 but adds to 34?
154
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