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