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