For any confused students, this problem is not suggesting that 851 is special! That's factorial notation,

*n!,*meaning multiply the integer

*n*by all the positive integers less than

*n*. (Yeah,

*n*must be a positive integer to begin with.)

For example, 6! = 6*5*4*3*2*1 = 720

For completeness, 0! = 1

Thanks to Darren, Right on the Left Coast, for this one.

Thanks for the link! I hadn't seen this site before today.

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