Happy Number - Programming Example

Programming Example

The examples below apply the 'happy' process described in the definition of happy given at the top of this article, repeatedly; after each time, they check for both halt conditions: reaching 1, and repeating a number. Everything else is book-keeping (for example, the Python example precomputes the squares of all 10 digits).

  • Simple test in Python to check if a number is happy.
SQUARE = dict def is_happy(n): s = set while (n > 1) and (n not in s): s.add(n) n = sum(SQUARE for d in str(n)) return n == 1

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