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Sum of subfactorials (Posted on 2018-02-25) Difficulty: 3 of 5
What is the only number equal to the sum of subfactorials of its digits?

Hint: it is below 150000

This fact was discovered by Malachy in 1979.

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
Puzzle ThoughtsK Sengupta2022-07-10 22:04:06
Some Thoughtsabout MadachyAdy TZIDON2018-02-28 05:38:13
Solutioncomputer solutionCharlie2018-02-25 11:54:05
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