https://topic.alibabacloud.com/a/factorial-trailing-zeroes_8_8_31437240.html
Factorial Trailing Zeroes
Transferred from: http://blog.csdn.net/doc_sgl/article/details/42344441Only 2 and 5 multiplied to appear 0, where the whole ten can also be seen as 2 and 5...
trailing zeroesfactorial
https://www.geeksforgeeks.org/dsa/smallest-number-least-n-trailing-zeroes-factorial/
Smallest number with at least n trailing zeroes in factorial - GeeksforGeeks
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n trailing zeroessmallest numberat leastfactorialgeeksforgeeks