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