Problem 52609. Easy Sequences 11: Factorial Digits without Trailing Zeros

Ramon Villamangca

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Here is an easy one...
It is not difficult to count the number of digits of the factorial of a given number. For example for 'n = 10', we have:
  >> length(num2str(factorial(10)))
  >> ans =
     7
But 2 of those digits are just trailing zeros. So, for 10!, if we remove the trailing zeros, there would only be 5 digits left.
Write a function that outputs the number of digits of factorials excluding trailing zeros.

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Last Solution submitted on Sep 16, 2026

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