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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
Tags:
numbers
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sum to infinity
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the only crossnumber
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Archive
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▼ show ▼
▲ hide ▲
Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
quadrilaterals
complex numbers
elections
dice
circles
prime numbers
volume
means
colouring
integration
consecutive numbers
factors
algebra
odd numbers
sequences
floors
sums
addition
digital clocks
differentiation
perfect numbers
partitions
chalkdust crossnumber
ellipses
bases
scales
dodecagons
cryptic crossnumbers
palindromes
digits
square grids
range
averages
folding tube maps
hexagons
logic
cubics
tiling
mean
digital products
numbers
number
quadratics
polygons
square numbers
wordplay
calculus
factorials
clocks
unit fractions
pentagons
multiplication
angles
medians
coins
polynomials
consecutive integers
decahedra
shape
cube numbers
taxicab geometry
probability
numbers grids
median
surds
area
menace
albgebra
remainders
star numbers
chocolate
geometric mean
even numbers
doubling
perimeter
speed
cryptic clues
3d shapes
coordinates
sport
the only crossnumber
parabolas
functions
gerrymandering
ave
multiples
triangle numbers
christmas
planes
irreducible numbers
sets
dominos
neighbours
triangles
squares
arrows
games
routes
rectangles
percentages
sum to infinity
spheres
integers
products
time
determinants
rugby
matrices
tournaments
expansions
indices
crosswords
axes
dates
crossnumbers
advent
2d shapes
square roots
pascal's triangle
geometric means
combinatorics
fractions
money
cards
balancing
trigonometry
shapes
powers
lines
probabilty
proportion
grids
tangents
regular shapes
geometry
symmetry
books
graphs
division
binary
chess
people maths
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