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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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sum to infinity
cryptic clues
tournaments
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surds
ave
even numbers
xor
polygons
area
range
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2d shapes
dodecagons
matrices
crossnumbers
taxicab geometry
binary
geometry
cryptic crossnumbers
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