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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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Q: A list of triangular numbers up to 120?
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