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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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dodecagons
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cryptic clues
dominos
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cryptic crossnumbers
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sum to infinity
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star numbers
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Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
numbers
percentages
sets
circles
decahedra
square grids
wordplay
cards
axes
prime numbers
averages
integers
cryptic crossnumbers
shape
means
proportion
geometric means
gerrymandering
shapes
range
ave
3d shapes
fractions
digits
the only crossnumber
determinants
probability
perfect numbers
pentagons
triangle numbers
medians
matrices
dates
median
products
expansions
colouring
factorials
crossnumber
combinatorics
polygons
perimeter
tournaments
crosswords
floors
money
trigonometry
balancing
remainders
powers
algebra
indices
logic
multiples
triangles
cube numbers
tangents
tiling
menace
symmetry
chalkdust crossnumber
people maths
coordinates
sums
lines
consecutive integers
mean
probabilty
speed
numbers grids
calculus
cryptic clues
chocolate
irreducible numbers
doubling
elections
games
pascal's triangle
consecutive numbers
complex numbers
2d shapes
star numbers
factors
rectangles
cubics
binary
parabolas
multiplication
sequences
even numbers
spheres
hexagons
dodecagons
arrows
surds
angles
rugby
taxicab geometry
grids
folding tube maps
bases
routes
volume
christmas
polynomials
time
crossnumbers
dice
sport
division
graphs
quadrilaterals
clocks
unit fractions
square roots
scales
sum to infinity
digital clocks
geometric mean
coins
dominos
books
square numbers
albgebra
partitions
ellipses
planes
regular shapes
chess
digital products
addition
differentiation
odd numbers
palindromes
quadratics
squares
number
area
functions
integration
neighbours
geometry
advent
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