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Advent calendar 2015
23 December
All 2015 advent puzzles
~
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This number is a prime number. If you treble it and add 16, the result is also prime. Repeating this will give 11 prime numbers in total (including the number itself).
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books
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cryptic clues
chocolate
3d shapes
dominos
grids
mean
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digital clocks
integration
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tiling
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