What this calculator does
Calculate n-factorials with step sizes from one through five using exact integer arithmetic.
How it works
The calculator evaluates n!ₖ = n(n − k)(n − 2k)… until the next factor would be nonpositive. Inputs are checked before calculation, and invalid values such as zero denominators or out-of-range selections produce a clear error instead of a misleading result.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
2-
?n=nNumber · Required · Default: 10
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?order=Number of factorial marksNumber · Required · Default: 2
Outputs
3-
resultMultifactorialText · Primary output
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termCountNumber of multiplied termsWhole number
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notationNotationText
Inputs and results
The inputs are n, Number of factorial marks. Results include Multifactorial, Number of multiplied terms, Notation.