Addition of sum_of_digits() function

Ideas
1

Like the factorial() function of the math mode module, the addition of the Fibonacci series would be of great use. Hereby, I consider the addition of the sum_of_digits() function in the math module of great use.
Please let me know your views.

2

Could you provide a use case for sum_of_digits()?

3

See the response to your other idea Addition of fibonacci function

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