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 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025