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Advent calendar 2015

14 December

What is the only palindromic three digit prime number which is also palindromic when written in binary?

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

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