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Advent calendar 2015
23 December
All 2015 advent puzzles
~
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This number is a prime number. If you treble it and add 16, the result is also prime. Repeating this will give 11 prime numbers in total (including the number itself).
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angles
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symmetry
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powers
scales
median
colouring
books
parabolas
numbers
matrices
sequences
regular shapes
fractions
3d shapes
volume
area
tournaments
pentagons
binary
digits
chess
geometry
people maths
square numbers
graphs
wordplay
remainders
coordinates
even numbers
shapes
folding tube maps
planes
indices
hexagons
number
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spheres
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christmas
lines
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