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February 1, 2015

February 1, 2015

Posted by **john** on Wednesday, August 1, 2012 at 9:22pm.

- number theory -
**MathMate**, Wednesday, August 1, 2012 at 10:06pmIf you note that we only need to calculate

6

s=∑ i!

n=1

or

s=873 mod 21 = 12

Because all terms 7! and beyond are divisible by 21.

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