Triangular arbitrage is a strategy in which a trader profits from price discrepancies between three digital assets on different platforms.

But it was triangular numbers that got the ball rolling in the first place. Sign up here for the weekly Science Times newsletter.

“If you add up all the numbers from 1 to 9, you get 45. 45 is sometimes called a triangular number, or a pyramid number.” The next perfect square year won’t arrive until 2116.

A triangular number is one that fits the formula n (n+1)/2, such as 1, 3, 6, 10, 15. Even if I told you Harry’s triangular number you would not be able to deduce with certainty which perfect ...