Category Archives: problems and puzzles

The short arm of coincidence

James Tanton tosses off number theory problems the way John D. Rockefeller handed out dimes. I wrote about one of Tanton’s problems back in January. Then a few weeks ago this tweet about factorials and squares snagged my attention, and … Continue reading

Posted in computing, featured, mathematics, problems and puzzles | 14 Comments

The uniqueness constraint

For the past few weeks the Sunday New York Times has been publishing a puzzle called Capsules, devised by Wei-Hwa Huang. Here are the instructions: Place numbers in the grid so that each outlined region contains the numbers 1 to … Continue reading

Posted in problems and puzzles | 17 Comments

A Tantonalizing Problem

In times like these one craves distraction, or maybe anaesthesia. On the whole, mathematics is better for you than ethanol, and you can even do it while driving. So in spare moments I’ve been noodling away at the following problem, … Continue reading

Posted in mathematics, problems and puzzles | 7 Comments

Lost in Translation

J. E. Littlewood told a cute story about a paper he supposedly published in the Comptes Rendus de l’Académie des sciences de Paris. The paper had three footnotes, which read, in French: I am greatly indebted to Prof. Riesz for … Continue reading

Posted in linguistics, problems and puzzles | 3 Comments

17 x 17 = $289.00

This just in from Bill Gasarch: The quest for a rectangle-free four-coloring of the 17-by-17 grid is over. If you don’t know what that’s all about, and you’d like to find out, see Bill’s blog post from 2009 or my … Continue reading

Posted in computing, mathematics, problems and puzzles | 6 Comments