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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
Advent calendar 2022
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List of all puzzles
Tags
proportion
mean
dice
matrices
products
clocks
cryptic clues
cryptic crossnumbers
quadrilaterals
combinatorics
sport
functions
doubling
logic
sequences
digital clocks
palindromes
probabilty
shapes
perimeter
axes
speed
games
the only crossnumber
crossnumbers
area
star numbers
division
averages
taxicab geometry
polygons
expansions
tournaments
geometric mean
spheres
chess
colouring
elections
ave
differentiation
probability
integers
floors
remainders
advent
planes
dodecagons
sets
hexagons
squares
means
square numbers
complex numbers
cubics
square roots
tiling
grids
symmetry
pascal's triangle
bases
time
surds
graphs
chocolate
digits
triangle numbers
lines
geometric means
calculus
decahedra
christmas
digital products
wordplay
even numbers
pentagons
multiples
perfect numbers
algebra
routes
crosswords
people maths
determinants
cards
number
numbers
gerrymandering
quadratics
fractions
polynomials
binary
dates
ellipses
factorials
albgebra
rugby
coins
2d shapes
percentages
integration
sum to infinity
regular shapes
rectangles
scales
consecutive integers
balancing
3d shapes
money
range
odd numbers
menace
irreducible numbers
consecutive numbers
crossnumber
tangents
shape
triangles
parabolas
arrows
trigonometry
dominos
prime numbers
sums
median
chalkdust crossnumber
addition
angles
unit fractions
circles
coordinates
cube numbers
indices
factors
folding tube maps
multiplication
geometry
books
partitions
volume
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