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

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