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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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games
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fractions
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the only crossnumber
mean
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christmas
volume
speed
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ave
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clocks
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dates
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elections
balancing
integration
square roots
cubics
chocolate
multiplication
squares
time
indices
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lines
digital clocks
percentages
algebra
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routes
wordplay
sport
dice
differentiation
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shape
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cryptic clues
geometric means
remainders
rugby
triangles
factorials
partitions
coordinates
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people maths
median
sequences
digital products
division
functions
pascal's triangle
advent
square numbers
floors
gerrymandering
range
money
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chalkdust crossnumber
colouring
averages
geometric mean
quadratics
arrows
regular shapes
determinants
folding tube maps
probability
crosswords
combinatorics
chess
factors
palindromes
menace
tiling
2d shapes
graphs
parabolas
proportion
books
sets
expansions
albgebra
digits
surds
polygons
ellipses
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complex numbers
products
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crossnumbers
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