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Advent calendar 2017
8 December
All 2017 advent puzzles
~
More information
The odd numbers are written in a pyramid.
1
3
5
7
9
11
etc.
What is the mean of the numbers in the 23rd row?
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529
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numbers
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Archive
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Most recent collections
Advent calendar 2025
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
List of all puzzles
Tags
symmetry
rugby
medians
folding tube maps
dodecagons
digital products
prime numbers
wordplay
multiples
advent
albgebra
area
perimeter
books
binary
perfect numbers
geometric mean
chess
ellipses
dates
rectangles
odd numbers
squares
neighbours
circles
3d shapes
angles
division
coordinates
quadratics
menace
the only crossnumber
averages
volume
numbers
bases
quadrilaterals
determinants
calculus
indices
cubics
shapes
balancing
mean
algebra
number
triangles
clocks
crossnumbers
axes
parabolas
digital clocks
lines
elections
routes
ave
arrows
christmas
prime factors
combinatorics
square grids
games
xor
multiplaction squares
consecutive numbers
decahedra
geometry
people maths
hexagons
scales
chocolate
square numbers
polygons
percentages
surds
remainders
sums
median
pentagons
fractions
cards
money
triangle numbers
cube numbers
addition
colouring
differentiation
matrices
complex numbers
taxicab geometry
square roots
lists
products
palindromes
functions
sets
sum to infinity
integers
sequences
logic
pascal's triangle
regular shapes
polynomials
tiling
2d shapes
gerrymandering
probabilty
floors
trigonometry
partitions
cryptic clues
graphs
unit fractions
multiplication
proportion
shape
factors
speed
planes
dominos
probability
consecutive integers
time
tangents
crosswords
grids
powers
factorials
range
digits
irreducible numbers
even numbers
cryptic crossnumbers
coins
integration
star numbers
expansions
spheres
sport
means
dice
chalkdust crossnumber
doubling
geometric means
tournaments
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