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