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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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even numbers
algebra
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advent
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speed
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folding tube maps
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rectangles
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polynomials
tournaments
range
dates
prime numbers
cryptic crossnumbers
integration
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colouring
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volume
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bases
dodecagons
number
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sum to infinity
circles
ave
people maths
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gerrymandering
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unit fractions
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Archive
Show me a random puzzle
▼ show ▼
▲ hide ▲
Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
prime numbers
geometry
means
parabolas
ave
cryptic crossnumbers
combinatorics
indices
tiling
dominos
factors
perimeter
logic
hexagons
squares
proportion
calculus
consecutive integers
routes
geometric mean
quadrilaterals
rugby
probabilty
shape
wordplay
multiples
ellipses
cards
coins
taxicab geometry
games
numbers
2d shapes
multiplication
gerrymandering
area
mean
surds
crosswords
rectangles
chocolate
differentiation
products
dodecagons
coordinates
triangle numbers
floors
partitions
books
sequences
cryptic clues
3d shapes
clocks
time
grids
shapes
trigonometry
crossnumber
square roots
planes
determinants
dates
triangles
circles
dice
algebra
sum to infinity
integration
symmetry
regular shapes
matrices
lines
averages
star numbers
complex numbers
even numbers
tangents
square numbers
remainders
money
cubics
irreducible numbers
median
range
consecutive numbers
speed
odd numbers
polynomials
axes
balancing
tournaments
doubling
chess
elections
christmas
functions
palindromes
pentagons
people maths
expansions
geometric means
probability
angles
advent
menace
pascal's triangle
percentages
quadratics
albgebra
folding tube maps
integers
crossnumbers
spheres
number
bases
the only crossnumber
sums
scales
digital clocks
polygons
fractions
unit fractions
volume
chalkdust crossnumber
sets
binary
perfect numbers
decahedra
digits
division
sport
factorials
arrows
addition
digital products
colouring
cube numbers
graphs
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