Sunday Afternoon Maths LIII

 Posted on 2016-05-29 

Lots of ones

Is any of the numbers 11, 111, 1111, 11111, ... a square number?

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An integral

Source: Alex Bolton (inspired by Book Proofs blog)
What is

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If you enjoyed these puzzles, check out Sunday Afternoon Maths LXVII,
puzzles about 2d shapes, or a random puzzle.


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Sunday Afternoon Maths LXV

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


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