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

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