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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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balancing
rectangles
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ave
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christmas
rugby
advent
tangents
consecutive numbers
area
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chalkdust crossnumber
scales
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ellipses
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sum to infinity
expansions
regular shapes
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spheres
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range
cards
factors
speed
volume
axes
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cubics
angles
clocks
doubling
sets
multiplaction squares
dates
dice
geometric means
people maths
symmetry
squares
dominos
pentagons
square numbers
sequences
powers
tiling
books
products
games
menace
functions
chocolate
albgebra
prime numbers
graphs
geometric mean
planes
quadrilaterals
multiplication
sums
probability
coins
polynomials
combinatorics
sport
remainders
percentages
triangle numbers
square grids
irreducible numbers
number
lines
floors
indices
determinants
polygons
division
2d shapes
star numbers
integration
multiples
neighbours
quadratics
gerrymandering
xor
shapes
proportion
consecutive integers
money
averages
digits
palindromes
elections
square roots
median
odd numbers
digital products
algebra
complex numbers
surds
decahedra
unit fractions
even numbers
digital clocks
perfect numbers
means
bases
colouring
crossnumbers
taxicab geometry
the only crossnumber
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fractions
pascal's triangle
folding tube maps
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