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Advent calendar 2017
21 December
All 2017 advent puzzles
~
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The factors of 6 (excluding 6 itself) are 1, 2 and 3. \(1+2+3=6\), so 6 is a
perfect number
.
Today's number is the only three digit perfect number.
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496
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mean
volume
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star numbers
scales
xor
medians
determinants
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logic
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ave
square numbers
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taxicab geometry
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algebra
multiplaction squares
symmetry
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unit fractions
doubling
neighbours
angles
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dice
lines
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digital clocks
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