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