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