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