# Python Math: Get the nth tetrahedral number from a given integer(n) value

## Python Math: Exercise-84 with Solution

A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The formula for the nth tetrahedral number is represented by the 3rd rising factorial of n divided by the factorial of 3:

Example of tetrahedral numbers:

N | Tetrahedral Number |
---|---|

1 | 1 |

2 | 4 |

3 | 10 |

4 | 20 |

5 | 35 |

6 | 56 |

Write a Python program to get the n^{th} tetrahedral number from a given integer(n) value.

**Sample Solution:**

**Python Code:**

```
def test(n):
return (n * (n + 1) * (n + 2)) / 6
n = 1
print("\nOriginal Number:",n)
print("Tetrahedral number:",test(n))
n = 2
print("\nOriginal Number:",n)
print("Tetrahedral number:",test(n))
n = 6
print("\nOriginal Number:",n)
print("Tetrahedral number:",test(n))
```

Sample Output:

Original Number: 1 Tetrahedral number: 1.0 Original Number: 2 Tetrahedral number: 4.0 Original Number: 6 Tetrahedral number: 56.0

**Flowchart:**

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**Previous:** Write a Python program to calculate the aliquot sum of an given integer.

**Next:** Write a Python program to get the sum of the powers of all the numbers from start to end (both inclusive).

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## Python: Tips of the Day

**Getting rid of unwanted characters:**

You can get rid of whitespaces or any specific character using strip methods in Python. You can use either plain strip for both sides, lstrip for the left side and rstrip for the right side only.

str="+++Welcome python+++" str.strip() print(str)

Output:

+++Welcome python+++

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