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Advent calendar 2015
14 December
All 2015 advent puzzles
~
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What is the only palindromic three digit prime number which is also palindromic when written in binary?
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313
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numbers
,
prime numbers
,
palindromes
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perimeter
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prime numbers
sets
chalkdust crossnumber
odd numbers
albgebra
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unit fractions
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lines
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ellipses
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the only crossnumber
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integration
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multiples
sequences
addition
cryptic crossnumbers
wordplay
dodecagons
gerrymandering
complex numbers
chocolate
factorials
partitions
speed
binary
taxicab geometry
consecutive numbers
differentiation
ave
elections
shapes
time
multiplication
people maths
irreducible numbers
christmas
square numbers
area
tournaments
fractions
probability
mean
crossnumbers
palindromes
rugby
pascal's triangle
circles
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perfect numbers
sum to infinity
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division
doubling
advent
floors
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folding tube maps
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digits
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Most recent collections
Advent calendar 2025
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List of all puzzles
Tags
quadratics
angles
shapes
functions
gerrymandering
decahedra
median
integers
doubling
rectangles
unit fractions
chalkdust crossnumber
area
elections
tangents
combinatorics
squares
multiplaction squares
triangle numbers
number
square numbers
surds
range
sums
dice
coordinates
pentagons
sets
dominos
sequences
volume
geometric means
games
multiplication
3d shapes
floors
tiling
proportion
digital clocks
the only crossnumber
taxicab geometry
indices
lines
prime numbers
chocolate
time
logic
consecutive numbers
binary
hexagons
grids
rugby
differentiation
division
cubics
palindromes
square grids
neighbours
symmetry
matrices
pascal's triangle
numbers
means
polynomials
multiples
parabolas
star numbers
probabilty
powers
spheres
circles
addition
chess
cards
perimeter
people maths
money
consecutive integers
sport
expansions
algebra
polygons
factors
clocks
arrows
advent
speed
dates
graphs
digital products
determinants
complex numbers
odd numbers
mean
routes
bases
perfect numbers
calculus
axes
factorials
percentages
triangles
products
even numbers
digits
fractions
medians
2d shapes
irreducible numbers
square roots
crosswords
christmas
regular shapes
ave
scales
partitions
sum to infinity
dodecagons
books
shape
coins
ellipses
geometric mean
cryptic clues
menace
lists
balancing
folding tube maps
averages
probability
prime factors
trigonometry
tournaments
xor
integration
wordplay
colouring
geometry
quadrilaterals
planes
albgebra
cube numbers
crossnumbers
cryptic crossnumbers
remainders
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