Python program to calculate n-th element of Triangle Numbers sequence.

# © 2017 TheFlyingKeyboard and released under MIT License
# theflyingkeyboard.net

def triangleNumber(n):
  return (n * (n + 1)) / 2

data = int(input("Enter a number: "))

print(data, "-th triangle number is equal to:", triangleNumber(data))

 

Python Triangle Number
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