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

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