!
(Published on 20. March 2022, 14:40 by RockyRoer)
Teaser Question:
This puzzle is much easier if you try to do it without a calculator. This question will help you get going in the right direction.
How many zeroes are at the end of 400!
(recall 400! = 400*399*398*...*3*2*1)
The Rules:
- Normal sudoku rules apply.
- The numbers in each cage cannot repeat, and must multiply to some factorial number. The totals must be determined by the solver. Recall the factorial numbers are the following:
- 1! = 1
- 2! = 2
- 3! = 6
- 4! = 24
- 5! = 120
- 6! = 720
- 7! = 5040
- 8! = 40320
- 9! = 362880
The Puzzle:
Solution code: The number of zeroes at the end of 400! followed by the digits in column 5 from top to bottom.
Comments
on 22. March 2022, 05:43 by twobear
Very nice puzzle! I kind of underestimated the puzzle after seeing all the comments prior to my solve... closer to 3.5 stars for me :p
on 22. March 2022, 01:09 by Christounet
Nice puzzle ! Took me nearly as much time to do the puzzle as to figure out the number of zeros at the end of 400!
Reply: ha ha! Sorry? Not really… Hope you learned something. I am a math teacher after all. Posted a blog post on this question a few years ago, if anyone is interested: http://rockyroer.blogspot.com/2013/04/how-big-number-is-400.html I had forgotten it until I googled it myself and discovered my own article. Lol.
on 21. March 2022, 16:23 by SudokuExplorer
Fun and fairly easy puzzle, thanks! :-)
on 21. March 2022, 15:58 by Playmaker6174
A very fun and neat solve once I wrapped my mind in completely, quite funny how the solve turned out :}
on 21. March 2022, 14:40 by mathpesto
Very impressive setting and such an enjoyable solve! I loved the minimalism of the grid and the many deductions I was able to make throughout!
on 20. March 2022, 18:52 by DVFrank
What a great puzzle! Thanks for setting this! :^)
on 20. March 2022, 15:43 by kolot
Perfectly designed puzzle. Not too hard for me, 2.5~3 stars ;-)
