# 7 and Happy Numbers - Numberphile

- Author:
- Brady Haran, Dr Ria Symonds
- Subject:
- Computing and Information, Education, Mathematics
- Provider:
- Maryland Public Television
- Provider Set:
- Mathlanding: Elementary Mathematics Pathway
- Level:
- Upper Primary
- Grades:
- Grade 3, Grade 4, Grade 5

- Language:
- English
- Material Type:
- Activity/Lab
- Media Format:
- Video

- Maryland Public Television Abstract:
In this 1.5-minute video, mathematician Dr Ria Symonds describes a characteristic of numbers such as 7, which after repeated squaring of digits and summing of the squares, result in the number 1, the first natural number. This introduction invites an investigation to find other "happy" numbers, and to find out what happens to "sad" numbers.

## Comments