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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 2025
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List of all puzzles
Tags
tangents
axes
fractions
area
square numbers
sets
polygons
integration
prime numbers
division
balancing
digital products
range
multiplication
games
ellipses
factorials
scales
medians
complex numbers
consecutive integers
sum to infinity
unit fractions
angles
median
gerrymandering
clocks
factors
planes
probabilty
powers
number
people maths
coordinates
sequences
wordplay
dice
multiplaction squares
logic
remainders
decahedra
rugby
irreducible numbers
geometry
digital clocks
lines
cryptic clues
square grids
odd numbers
binary
geometric mean
christmas
expansions
products
pentagons
xor
neighbours
perfect numbers
tournaments
dates
geometric means
surds
crossnumbers
squares
consecutive numbers
determinants
cubics
chess
elections
ave
2d shapes
tiling
functions
polynomials
arrows
coins
star numbers
numbers
sums
albgebra
grids
pascal's triangle
indices
symmetry
circles
chocolate
matrices
means
shape
multiples
differentiation
cards
square roots
graphs
spheres
trigonometry
quadrilaterals
folding tube maps
cryptic crossnumbers
chalkdust crossnumber
integers
volume
perimeter
percentages
floors
doubling
quadratics
combinatorics
dominos
calculus
speed
prime factors
3d shapes
palindromes
triangles
parabolas
hexagons
colouring
triangle numbers
taxicab geometry
regular shapes
rectangles
digits
menace
probability
money
routes
algebra
cube numbers
advent
partitions
addition
mean
the only crossnumber
crosswords
sport
time
books
proportion
averages
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dodecagons
even numbers
shapes
bases
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