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

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