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

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