mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2022

16 December

Noel writes the integers from 1 to 1000 in a large triangle like this:
The rightmost number in the row containing the number 6 is 9. What is the rightmost number in the row containing the number 300?

Show answer

Tags: numbers

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021

Advent calendar 2020


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2024