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Advent calendar 2015
17 December
All 2015 advent puzzles
~
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In March, I posted the puzzle
One Hundred Factorial
, which asked how many zeros 100! ends with.
What is the smallest number, n, such that n! ends with 50 zeros?
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205
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numbers
,
factorials
,
multiplication
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Most recent collections
Advent calendar 2023
Advent calendar 2022
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List of all puzzles
Tags
hexagons
planes
number
complex numbers
speed
unit fractions
perimeter
dominos
triangle numbers
mean
sums
time
coordinates
chess
tangents
addition
squares
angles
indices
algebra
christmas
parabolas
ave
multiplication
star numbers
cubics
pascal's triangle
numbers
differentiation
balancing
digital clocks
cryptic crossnumbers
scales
sum to infinity
arrows
geometry
digits
graphs
money
tournaments
routes
cards
multiples
crossnumber
spheres
books
rugby
integers
binary
colouring
the only crossnumber
consecutive integers
elections
quadrilaterals
sport
rectangles
people maths
crossnumbers
means
area
symmetry
division
quadratics
taxicab geometry
albgebra
polygons
median
calculus
expansions
dates
percentages
irreducible numbers
probabilty
gerrymandering
combinatorics
circles
bases
even numbers
shapes
triangles
dice
square numbers
prime numbers
probability
logic
decahedra
cryptic clues
chalkdust crossnumber
pentagons
square roots
2d shapes
axes
advent
odd numbers
range
tiling
products
folding tube maps
menace
clocks
chocolate
sequences
perfect numbers
integration
ellipses
surds
palindromes
trigonometry
geometric mean
digital products
matrices
floors
fractions
shape
games
dodecagons
grids
functions
sets
geometric means
determinants
proportion
doubling
lines
volume
crosswords
averages
regular shapes
remainders
coins
polynomials
consecutive numbers
partitions
factorials
wordplay
factors
cube numbers
3d shapes
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