Finding the rightmost non-zero digit of \(n!\).

Link to the wiki.

Feel free to ask queries and/or give feedbacks in the comments. New problems and examples are welcomed to be added to the wiki.

Note by Tapas Mazumdar
1 year, 5 months ago

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1 vote

  Easy Math Editor

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold

- bulleted
- list

  • bulleted
  • list

1. numbered
2. list

  1. numbered
  2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.
2 \times 3 \( 2 \times 3 \)
2^{34} \( 2^{34} \)
a_{i-1} \( a_{i-1} \)
\frac{2}{3} \( \frac{2}{3} \)
\sqrt{2} \( \sqrt{2} \)
\sum_{i=1}^3 \( \sum_{i=1}^3 \)
\sin \theta \( \sin \theta \)
\boxed{123} \( \boxed{123} \)

Comments

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Woah! This is probably the only article on the internet that teaches us this technique!

A very good read!

Bonus: can you generalize this to "find the last "m" rightmost non-zero digits of n!" ?

Pi Han Goh - 1 year, 5 months ago

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Seems like a great challenge to me! Let me think about it.

P.S. Thanks for the compliments. :)

Tapas Mazumdar - 1 year, 5 months ago

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Thanks for creating this wonderful article! I've added your wiki page to the list of Number Theory wiki pages, under Rightmost non zero digit.

Calvin Lin Staff - 1 year, 4 months ago

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