Advent calendar 2019

24 December

There are six 3-digit numbers with the property that the sum of their digits is equal to the product of their digits. Today's number is the largest of these numbers.

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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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


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