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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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Most recent collections
Advent calendar 2023
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List of all puzzles
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palindromes
coordinates
parabolas
wordplay
sums
clocks
products
dates
multiplication
routes
even numbers
area
chalkdust crossnumber
complex numbers
axes
range
polygons
ellipses
ave
mean
dominos
integers
money
the only crossnumber
triangles
geometric means
quadrilaterals
digital products
sets
square numbers
expansions
logic
sequences
factorials
dodecagons
averages
algebra
scales
division
arrows
squares
shapes
digital clocks
cryptic clues
planes
unit fractions
grids
lines
perimeter
tiling
functions
square roots
cubics
quadratics
determinants
triangle numbers
proportion
graphs
median
tangents
hexagons
decahedra
numbers
time
speed
star numbers
perfect numbers
tournaments
gerrymandering
probabilty
doubling
polynomials
remainders
binary
crossnumbers
symmetry
digits
2d shapes
percentages
means
crosswords
folding tube maps
spheres
probability
advent
elections
pentagons
colouring
number
shape
angles
partitions
differentiation
pascal's triangle
cube numbers
sum to infinity
volume
irreducible numbers
multiples
rectangles
cryptic crossnumbers
balancing
chocolate
3d shapes
menace
rugby
integration
fractions
coins
crossnumber
regular shapes
bases
floors
people maths
circles
calculus
indices
geometric mean
albgebra
addition
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geometry
chess
books
factors
surds
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