Stage: 3 Challenge Level: 
Possible extension.
This problem is a special case of Factorial Fun.
Possible support
See also Fac Finding and Powerful Factorialwhich are also special cases.
This problem is a special case of Factorial Fun.
Possible support
See also Fac Finding and Powerful Factorialwhich are also special cases.
Working systematically. smartphone. Properties of numbers. Divisibility. Modulus arithmetic. Factorials. Multiplication & division. Prime factors. Factors and multiples. Workshop.
Published October 2000.
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