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Advent calendar 2025
19 December
All 2025 advent puzzles
~
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Eve uses the digits 1, 2, 3, 4, 5, 6, 7, 8 and 9 to write five square numbers (using each digit exactly once). What is largest square number that she made?
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The square numbers must be 1, 9, 25, 36, and
784
.
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sum to infinity
quadratics
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indices
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taxicab geometry
square grids
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products
square numbers
palindromes
ave
circles
planes
shape
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grids
probability
addition
angles
chess
binary
prime factors
routes
hexagons
cryptic clues
calculus
chalkdust crossnumber
prime numbers
perfect numbers
medians
digital clocks
geometry
cards
lists
quadrilaterals
even numbers
consecutive numbers
money
consecutive integers
remainders
polygons
dominos
mean
regular shapes
time
decahedra
parabolas
graphs
digital products
multiplication
irreducible numbers
perimeter
floors
logic
powers
triangles
combinatorics
cubics
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ellipses
determinants
volume
the only crossnumber
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multiples
averages
elections
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dodecagons
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symmetry
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