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Advent calendar 2017
7 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 sum of the numbers in the seventh row?
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343
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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
tiling
sum to infinity
triangles
triangle numbers
range
means
factorials
digital products
trigonometry
christmas
crossnumbers
graphs
pentagons
combinatorics
books
prime factors
clocks
people maths
square numbers
probability
shape
dominos
square roots
multiplaction squares
functions
rugby
parabolas
chess
lists
unit fractions
proportion
albgebra
perfect numbers
integers
shapes
digital clocks
sport
grids
pascal's triangle
irreducible numbers
geometric means
multiples
balancing
prime numbers
axes
arrows
scales
circles
probabilty
odd numbers
products
consecutive integers
integration
powers
elections
fractions
tangents
quadrilaterals
geometry
division
lines
sequences
differentiation
complex numbers
algebra
polygons
partitions
numbers
multiplication
cryptic clues
money
colouring
decahedra
games
chalkdust crossnumber
gerrymandering
ellipses
hexagons
neighbours
taxicab geometry
folding tube maps
speed
star numbers
cards
sums
determinants
medians
square grids
angles
crosswords
dice
percentages
tournaments
dates
advent
consecutive numbers
xor
area
coins
cryptic crossnumbers
coordinates
polynomials
cube numbers
indices
squares
volume
perimeter
bases
planes
factors
sets
median
rectangles
symmetry
calculus
quadratics
cubics
mean
floors
routes
addition
chocolate
averages
dodecagons
matrices
3d shapes
surds
the only crossnumber
palindromes
ave
logic
menace
2d shapes
spheres
regular shapes
even numbers
number
doubling
wordplay
geometric mean
time
expansions
remainders
binary
digits
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