5 December

Today's number is the number of ways that 35 can be written as the sum of distinct numbers, with none of the numbers in the sum being divisible by 9.
Clarification: By "numbers", I mean (strictly) positive integers. The sum of the same numbers in a different order is counted as the same sum: eg. 1+34 and 34+1 are not different sums. The trivial sum consisting of just the number 35 counts as a sum.


Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020