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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
Tags:
numbers
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the only crossnumber
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floors
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sum to infinity
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Archive
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▼ show ▼
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
gerrymandering
taxicab geometry
sequences
digital clocks
polynomials
elections
sum to infinity
addition
star numbers
graphs
dominos
triangle numbers
arrows
people maths
probability
multiplication
symmetry
routes
shapes
cube numbers
parabolas
chalkdust crossnumber
money
digital products
quadratics
ellipses
trigonometry
crossnumbers
rectangles
time
the only crossnumber
means
logic
proportion
percentages
perimeter
2d shapes
perfect numbers
cryptic crossnumbers
circles
surds
irreducible numbers
decahedra
tournaments
cards
square numbers
pascal's triangle
indices
axes
rugby
spheres
menace
ave
multiples
clocks
regular shapes
binary
numbers
coordinates
crosswords
shape
odd numbers
folding tube maps
tiling
calculus
products
range
even numbers
hexagons
3d shapes
remainders
christmas
fractions
advent
integration
dice
combinatorics
chocolate
balancing
area
pentagons
doubling
functions
planes
differentiation
probabilty
coins
matrices
albgebra
scales
wordplay
mean
cubics
angles
geometric mean
averages
geometric means
digits
consecutive numbers
volume
determinants
quadrilaterals
tangents
crossnumber
polygons
median
triangles
integers
floors
sets
expansions
squares
speed
dodecagons
geometry
complex numbers
square roots
bases
algebra
lines
grids
palindromes
consecutive integers
factorials
number
prime numbers
division
factors
colouring
chess
dates
partitions
sport
books
sums
games
unit fractions
cryptic clues
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