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